git 2.2.0

Note for OSX builds:
* Building on older MacOS X systems automatically sets the necessary
  NO_APPLE_COMMON_CRYPTO build-time option.

git-imap-send links to openssl with this new release, so make dependency
on it mandatory.

The custom patch used in 2.1.X of this formula has been merged upstream
as 960160b.
git: update 2.2.0 bottle.