Don't check CC on Darwin
Don't check CC on Darwin

CC is clang on Darwin and the output is different so this just fails
every time. We *should* add clang checks at some point though.

jseely/ohai,jseely/ohai,mattray/ohai,mattray/ohai,jaymzh/ohai,chef/ohai,higanworks/ohai,chef/ohai,higanworks/ohai,jaymzh/ohai