PATCH: vc-git.el: alternative git executable locations

[Matthew Daniel]

Hello Alexandre,

I saw on emacs-devel that patches against vc-git.el should be directed to you.

I interact with some git projects, but I do not leave the MinGW-git in
my PATH. Thus, I need to be able to tell Emacs where to find git.

The other vc elisps used a defcustom named vc-${vc}-program, so I
named the git one to follow their convention.

  Thanks for your time,
  -- /v\atthew

emacs_vc-git.patch
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