On automated commits

Hi!

This was reported at
https://sourceware.org/bugzilla/show_bug.cgi?id=31881 and Nick agreed
it's worth discussing on the ML.

Currently, binutils-gdb.git gets nightly commits to each active release
branch and master.

This is a bit noisy - especially so for the release branches where
it makes it hard to see if there's a new commit to backport downstream,
obfuscates git log, and also as pointed out in the PR, consumes disk
space forever.

On the PR, mjw suggests using gnulib's git-version-gen - which is a
solution I like the idea of (I have some draft to implement it for
Valgrind too) instead of automated commits to bump the version.

Nick also then says:
> I do like the idea of the configure file generating the bfd/version.h file
> automatically however, so if someone wants to write a potential patch that
> would be great.

Rostislav on the PR seems he may be up for working on it, but if he
can't, I might be able to when I'm less busy.

Thoughts?

thanks,
sam

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