bug#23076: 24.5; vc-git: add a new variable for log output coding system

[Eli Zaretskii]

> From: Nikolay Kudryavtsev <nikolay.kudryavtsev@gmail.com>
> Cc: 23076@debbugs.gnu.org
> Date: Mon, 25 Jul 2016 21:46:27 +0300
> 
> Here's a patch that fixes vc-git commits over tramp on windows.

Thanks.  Michael, could you please review this?

> I don't have the papers signed, but I think this counts as a trivial 
> change. If not I'm willing to sign them.

Yes, it's small enough.  But I encourage you to start the paperwork
rolling anyway, so we could continue accepting your contributions in
the future.

> Hope this would be applied into emacs-25 before release.

Sorry, too late for that: the first release candidate is already out.