dpkg-buildpackage broke rp-pppoe building

[Gianfranco Costamagna]

Hello, few things broke with last dpkg uploads:
https://pastebin.ubuntu.com/p/2GN5fdtpsz/
configure:2498: gcc -g -O2 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/rp-pppoe-4.0-1ubuntu1=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fdebug-prefix-map=/rp-pppoe-4.0-1ubuntu1=/usr/src/rp-pppoe-4.0-1ubuntu1 -Wdate-time -D_FORTIFY_SOURCE=3 -Wl,-Bsymbolic-functions -flto=auto -ffat-lto-objects -Wl,-z,relro -Wl,-z,now -specs=/usr/share/dpkg/elf-package-metadata.specs conftest.c >&5
gcc: fatal error: environment variable 'DEB_VERSION' not defined

(probably this is due to not having the standard dh calls)

Also,
Use of uninitialized value in string eq at /usr/bin/dpkg-genbuildinfo line 337.
Are printed for newly introduced variables:
DEB_BUILD_OS_RELEASE_ID DEB_SOURCE DEB_VERSION