Add sensible information about the OS X platform to diagnose issue #8423: test_pep277 fails on "x86 Tiger" buildbot but not on "PPC Tiger".
Add sensible information about the OS X platform to diagnose issue #8423:
test_pep277 fails on "x86 Tiger" buildbot but not on "PPC Tiger".

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