[issue27593] Deprecate sys._mercurial and create sys._git

[Brett Cannon]

Brett Cannon added the comment:

I had thought about trying to pull down the remote but it did seems unnecessarily messy when the SHA1 hash should match across various remotes only when the commits actually match.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27593>
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