drop configure~ (backup) from git and tarballs?

[Michael Tokarev via Unbound-users]

Hi!

Maybe it's a good idea to avoid storing configure~ (the backup) in
git and in the release tarballs?

I'd say configure should not be in git too, but this is questionable.
For configure~, things should be clear, no?

BTW, in 1.24 release, there's mention of usage of sphinx to generate
the manpages, but each of README.md and docs/README.man refers to
each other for instructions without providing ones :)

Thanks,

/mjt