Merge pull request #13381 from rgacogne/ddist-clean-up-nghttp2-no-doh

dnsdist: Fix the case where nghttp2 is available but DoH is disabled

diff --cc pdns/dnsdist-tcp.cc
Simple merge

diff --cc pdns/dnsdist.cc
Simple merge

diff --cc pdns/dnsdistdist/Makefile.am
Simple merge

diff --cc pdns/dnsdistdist/dnsdist-nghttp2-in.cc
Simple merge

diff --cc pdns/dnsdistdist/test-dnsdistnghttp2_cc.cc
Simple merge