bug#23075: 24.5; vc-git-command should use coding-system-for-read

[Óscar Fuentes]

Andreas Schwab <schwab@linux-m68k.org> writes:

> Garbage in which way?

In the sense that what is shown in the diff does not resemble what the
file contains, nor it even makes sense to a human.

> The diff output is encoded in iso-2022-7bit, but Emacs doesn't know
> that since the coding cookie is missing.

Does git always use that encoding? If not, on what it depends the
encoding used by git?