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

[Ned Deily]

Ned Deily added the comment:


New changeset e9213d929d7b0075539e87416f6a6fb86c27454b by Ned Deily in branch '3.6':
bpo-27593: Revise git SCM build info. (#744) (#745)
https://github.com/python/cpython/commit/e9213d929d7b0075539e87416f6a6fb86c27454b


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