Ensure that all GNU-based systems are considered to be UNIX
Ensure that all GNU-based systems are considered to be UNIX

Original Mozilla bug: https://bugzilla.mozilla.org/show_bug.cgi?id=749533

R=reed1
BUG=
TEST=

Review URL: https://codereview.appspot.com/6419057

csulmone/skia,csulmone/skia,csulmone/skia,csulmone/skia