ChangeLog files - server and client scripts

[Martin Liška]

Hello.

We've just installed server git hooks that verify git messages
for a correct ChangeLog format. For a limited time period, please
still apply ChangeLog changes to the corresponding ChangeLog files.
We'll use it for comparison of auto-generated CangeLog entries.

The format is documented here:
https://gcc.gnu.org/codingconventions.html#ChangeLogs

And I would recommend to install the new 'git gcc-verify' hook from:
contrib/gcc-git-customization.sh

Feel free to contact me about future troubles you'll see.

Thanks,
Martin