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

[Nikolay Kudryavtsev <nikolay.kudryavtsev@gmail.com>]

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This is a feature request that depends on resolution of 23075 
<http://debbugs.gnu.org/cgi/bugreport.cgi?bug=23075>.

Git for windows expects one coding system for log input, but returns a 
different one in log output.

In my specific example, with Russian language, I have to set up 
vc-git-commits-coding-system to windows-1251. But then, log output would 
still be in utf-8. Of course I can change this by setting git variable 
logoutputencoding, but this would screw up command line git log output. 
See this thread on help-gnu-emacs 
<https://lists.gnu.org/archive/html/help-gnu-emacs/2014-11/msg00426.html> and 
this thread on Git for Windows google group 
<https://groups.google.com/forum/#%21topic/msysgit/1YQKCNhWTqo> for more 
details.

So, I propose adding another variable called 
vc-git-log-output-coding-system, that would serve as emacs counterpart 
to git's logoutputencoding, just as vc-git-commits-coding-system serves 
a counterpart to commitencoding.

When and if 23075 is fixed we can just set coding-system-for-read to 
this new variable(whenever it's set) in vc-git-print-log.

-- 
Best Regards,
Nikolay Kudryavtsev


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