The documented and mandated step has been to not use buildconf but to
invoke 'autoreconf -fi' for four years already.
This change only drops buildconf from the release tarball, it remains
present in git for now.
Follow-up to 85868537d6Closes#14412
As runtests.md and testcurl.md. Very few people actually need these as
manpages anyway.
With this, we have no more nroff formatted documents in git.
Closes#14324