Sync 2.7.x, 3.3.x, and 3.4.x versions of OS X build-installer.py.
Sync 2.7.x, 3.3.x, and 3.4.x versions of OS X build-installer.py.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator