dnsdist: Generate tarballs via meson dist

[rgacogne]

Short description

This PR mimics what was done for the recursor, allowing DNSdist tarballs to be generated via meson. The resulting tarball builds fine, and looking at the differences with the same tarball generated via autotools did not show any issue (there are some differences, mostly generated files that are present in the meson-generated tarball and not in the autotools one. If anything this is a missing optimization in the autotools version). htmlfiles.h is included in the autotools version and not in the meson one, but that does not seem to be an issue.
It also includes the man-pages optimization added to the recursor in #15161.

Checklist

I have:

• read the CONTRIBUTING.md document
• compiled this code
• tested this code
• included documentation (including possible behaviour changes)
• documented the code
• added or modified regression test(s)
• added or modified unit test(s)

[miodvallat]

The GH UI is confused by the "delete symlink, replace with new file" cinematic so I can't attach comments to the new gen-version there.

Line 13, typo: consequenses -> consquences
Line 56 is -> if

[rgacogne]

The GH UI is confused by the "delete symlink, replace with new file" cinematic so I can't attach comments to the new gen-version there.

Line 13, typo: consequenses -> consquences Line 56 is -> if

Ah nice, we will have to fix these in three places now :D

[miodvallat]

Ah nice, we will have to fix these in three places now :D

That's the only way you'll eventually learn to write english correctly! 😈

[coveralls]

Pull Request Test Coverage Report for Build 13366145810

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 352 unchanged lines in 17 files lost coverage.
• Overall coverage decreased (-0.1%) to 64.486%

---

Files with Coverage Reduction	New Missed Lines	%
pdns/dnsdistdist/dnsdist-tcp.cc	1	76.33%
pdns/misc.cc	1	62.46%
pdns/recursordist/recursor_cache.cc	1	84.16%
pdns/arguments.cc	2	58.82%
pdns/backends/gsql/gsqlbackend.hh	2	97.71%
pdns/tcpiohandler.cc	2	68.18%
modules/gpgsqlbackend/spgsql.cc	3	67.7%
pdns/axfr-retriever.cc	3	66.94%
pdns/recursordist/test-syncres_cc2.cc	3	88.85%
pdns/dnsdistdist/dnsdist-carbon.cc	6	62.77%

Totals
Change from base Build 13328955165:	-0.1%
Covered Lines:	127604
Relevant Lines:	166873

---

💛 - Coveralls

[rgacogne]

The GH UI is confused by the "delete symlink, replace with new file" cinematic so I can't attach comments to the new gen-version there.

Line 13, typo: consequenses -> consquences Line 56 is -> if

I just pushed a commit fixing these typos, thanks!