Add Git recipe module to easily use this version of Git anywhere.
This fixes recipe bundling and unblocks the recipe roll.
Bug: skia:
Change-Id: Ib4d1361b7a52676e1992025b29e630ea3ada173b
Reviewed-on: https://skia-review.googlesource.com/18833
Reviewed-by: Ravi Mistry <rmistry@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
