Dropped patch v2 to the files directory of the FreeBSD ports, patch applied cleanly, reinstalled 2.4.38 and ran my test:

> $ curl --verbose -X POST --upload $HOME/sitex-document.3305025974265279540.zip https://blnn719x.ad001.siemens.net/ld-docgen/rest/documents --negotiate -u : -H 'Content-Type: application/zip'
> * Expire in 0 ms for 6 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 1 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 2 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 2 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 2 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 2 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 2 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 2 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 2 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 2 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 2 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 2 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 2 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 2 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 2 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 2 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 2 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 2 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 2 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 2 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 2 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 2 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 2 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> * Expire in 0 ms for 1 (transfer 0x28845000)
> *   Trying 147.54.64.19...
> * TCP_NODELAY set
> * Expire in 200 ms for 4 (transfer 0x28845000)
> * Connected to blnn719x.ad001.siemens.net (147.54.64.19) port 443 (#0)
> * ALPN, offering http/1.1
> * Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
> * successfully set certificate verify locations:
> *   CAfile: /usr/local/etc/ssl/cert.pem
>   CApath: none
> * TLSv1.2 (OUT), TLS header, Certificate Status (22):
> * TLSv1.2 (OUT), TLS handshake, Client hello (1):
> * TLSv1.2 (IN), TLS handshake, Server hello (2):
> * TLSv1.2 (IN), TLS handshake, Certificate (11):
> * TLSv1.2 (IN), TLS handshake, Server key exchange (12):
> * TLSv1.2 (IN), TLS handshake, Server finished (14):
> * TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
> * TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):
> * TLSv1.2 (OUT), TLS handshake, Finished (20):
> * TLSv1.2 (IN), TLS change cipher, Change cipher spec (1):
> * TLSv1.2 (IN), TLS handshake, Finished (20):
> * SSL connection using TLSv1.2 / ECDHE-RSA-AES256-GCM-SHA384
> * ALPN, server accepted to use http/1.1
> * Server certificate:
> *  subject: C=DE; O=Siemens; OU=PD LD AP DW; CN=blnn719x.ad001.siemens.net
> *  start date: May 31 13:00:16 2018 GMT
> *  expire date: May 31 13:00:16 2019 GMT
> *  subjectAltName: host "blnn719x.ad001.siemens.net" matched cert's "blnn719x.ad001.siemens.net"
> *  issuer: C=DE; ST=Bayern; L=Muenchen; O=Siemens; serialNumber=ZZZZZZB7; OU=Siemens Trust Center; CN=Siemens Issuing CA Intranet Server 2017
> *  SSL certificate verify ok.
> > POST /ld-docgen/rest/documents HTTP/1.1
> > Host: blnn719x.ad001.siemens.net
> > User-Agent: curl/7.64.0
> > Accept: */*
> > Content-Type: application/zip
> > Content-Length: 2056
> > Expect: 100-continue
> >
> * Expire in 1000 ms for 0 (transfer 0x28845000)
> < HTTP/1.1 401
> < Date: Tue, 19 Feb 2019 15:24:34 GMT
> < Server: Apache/2.4.38 (FreeBSD) OpenSSL/1.0.2q PHP/7.2.15 SVN/1.9.9 mod_auth_gssapi/1.6.1
> < X-Frame-Options: SAMEORIGIN
> < WWW-Authenticate: Negotiate
> < Content-Type: text/html;charset=utf-8
> < Content-Language: en
> < Content-Length: 1034
> < Connection: close
> <
> * Excess found in a non pipelined read: excess = 1034 url = /ld-docgen/rest/documents (zero-length body)
> * Closing connection 0
> * Issue another request to this URL: 'https://blnn719x.ad001.siemens.net/ld-docgen/rest/documents'
> * Hostname blnn719x.ad001.siemens.net was found in DNS cache
> *   Trying 147.54.64.19...
> * TCP_NODELAY set
> * Expire in 200 ms for 4 (transfer 0x28845000)
> * Connected to blnn719x.ad001.siemens.net (147.54.64.19) port 443 (#1)
> * ALPN, offering http/1.1
> * Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
> * successfully set certificate verify locations:
> *   CAfile: /usr/local/etc/ssl/cert.pem
>   CApath: none
> * SSL re-using session ID
> * TLSv1.2 (OUT), TLS handshake, Client hello (1):
> * TLSv1.2 (IN), TLS handshake, Server hello (2):
> * TLSv1.2 (IN), TLS change cipher, Change cipher spec (1):
> * TLSv1.2 (IN), TLS handshake, Finished (20):
> * TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):
> * TLSv1.2 (OUT), TLS handshake, Finished (20):
> * SSL connection using TLSv1.2 / ECDHE-RSA-AES256-GCM-SHA384
> * ALPN, server accepted to use http/1.1
> * Server certificate:
> *  subject: C=DE; O=Siemens; OU=PD LD AP DW; CN=blnn719x.ad001.siemens.net
> *  start date: May 31 13:00:16 2018 GMT
> *  expire date: May 31 13:00:16 2019 GMT
> *  subjectAltName: host "blnn719x.ad001.siemens.net" matched cert's "blnn719x.ad001.siemens.net"
> *  issuer: C=DE; ST=Bayern; L=Muenchen; O=Siemens; serialNumber=ZZZZZZB7; OU=Siemens Trust Center; CN=Siemens Issuing CA Intranet Server 2017
> *  SSL certificate verify ok.
> * Server auth using Negotiate with user ''
> > POST /ld-docgen/rest/documents HTTP/1.1
> > Host: blnn719x.ad001.siemens.net
> > Authorization: Negotiate YIISIgYG...
> > User-Agent: curl/7.64.0
> > Accept: */*
> > Content-Type: application/zip
> > Content-Length: 2056
> > Expect: 100-continue
> >
> * Expire in 1000 ms for 0 (transfer 0x28845000)
> * Done waiting for 100-continue
> * We are completely uploaded and fine
> < HTTP/1.1 100
> < HTTP/1.1 201
> < Date: Tue, 19 Feb 2019 15:24:35 GMT
> < Server: Apache/2.4.38 (FreeBSD) OpenSSL/1.0.2q PHP/7.2.15 SVN/1.9.9 mod_auth_gssapi/1.6.1
> < X-Frame-Options: SAMEORIGIN
> < WWW-Authenticate: Negotiate oYH1MIHyoA...
> < Location: http://blnn719x.ad001.siemens.net/ld-docgen/rest/documents/2c65479c-3e1e-4019-9c6d-215283e1e53f
> < Content-Length: 0
> <
> * Closing connection 1
> 

Hooray!

Note that SPNEGO authentication is performed by the local Tomcat and not HTTPd.