[MERGED] ---> Update git to v1.7.12.4

[Jason A. Donenfeld]

Hey John,

Just letting you know I've merged your git update series so far to
master. Lukas' next series of clean-ups [1] have been rebased off of
them, and I'm reviewing those now.

Hopefully Junio will be quick to merge your revert commit upstream,
and we can then trudge forward toward git 1.8.1.4 API compatibility.

Thanks again,
Jason


[1] http://git.zx2c4.com/cgit/log/?h=lf/fewer-statics