Incompatible with DPDK 21.11 - disable dpdk support

[Christian Ehrhardt ]

While I got positive feedback first when trying myself it was rather clear that UHD is not compatible with DPDK 21.11 yet :-/

FTBFS on all DPDK arches:
https://launchpad.net/ubuntu/+source/uhd/4.1.0.5-1build1

Example:
/<<PKGBUILDDIR>>/host/lib/include/uhdlib/transport/dpdk/udp.hpp:61:13: warning: "PKT_TX_IP_CKSUM" is deprecated
   61 | mbuf->ol_flags = PKT_TX_IP_CKSUM | PKT_TX_IPV4;
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/<<PKGBUILDDIR>>/host/lib/include/uhdlib/transport/dpdk/udp.hpp:61:13: warning: "PKT_TX_IPV4" is deprecated
   61 | mbuf->ol_flags = PKT_TX_IP_CKSUM | PKT_TX_IPV4;
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/<<PKGBUILDDIR>>/host/lib/transport/udp_dpdk_link.cpp: In member function ‘virtual void uhd::transport::udp_dpdk_link::release_send_buff(uhd::transport::frame_buff::uptr)’:
/<<PKGBUILDDIR>>/host/lib/transport/udp_dpdk_link.cpp:173:52: error: ‘struct rte_ether_hdr’ has no member named ‘d_addr’; did you mean ‘dst_addr’?
  173 | rte_ether_addr_copy(&_remote_mac, &l2_hdr->d_addr);
      | ^~~~~~
      | dst_addr
/<<PKGBUILDDIR>>/host/lib/transport/udp_dpdk_link.cpp:174:50: error: ‘struct rte_ether_hdr’ has no member named ‘s_addr’; did you mean ‘dst_addr’?
  174 | rte_ether_addr_copy(&local_mac, &l2_hdr->s_addr);
      | ^~~~~~
      | dst_addr

In a similar fashion to
=> https://github.com/EttusResearch/uhd/commit/b17d2dfa988344debe63f1b5d7e8556fef87218f
We'd need a change to support DPDK 21.11

DPDK 21.11 is strictly needed for jammy and being important itself and the new openvswitch/OVN versions.

But then OTOH UHD has way to many dependencies to "just remove it" until ready for the new DPDK.

Instead I'll disable the DPDK support which isn't strictly needed to make use of UHD and resolves this dependency issue until upstream implements the DPDK 21.11 API.
It is "only" used for the usual DPDK speedup (https://kb.ettus.com/Getting_Started_with_DPDK_and_UHD) that you'd expect but has no dependencies in any of the projects consuming UHD so far:
  $ reverse-depends --release jammy libuhd4.1.0-dpdk
  Reverse-Depends
  * libuhd4.1.0-dpdk-tests
  $ reverse-depends --release jammy libuhd4.1.0-dpdk-tests
  No reverse dependencies found

Upstream report to get 21.11 support
=> https://github.com/EttusResearch/uhd/issues/547

[Launchpad Janitor (janitor)]

This bug was fixed in the package uhd - 4.1.0.5-1ubuntu1

---------------
uhd (4.1.0.5-1ubuntu1) jammy; urgency=medium

  * Disable DPDK support as UHD is yet incompatible with dpdk 21.11
    that is required for Jammy (LP: #1957754)

 -- Christian Ehrhardt <email address hidden> Thu, 13 Jan 2022 08:11:15 +0100