macosx: Release CGColorRef properly
macosx: Release CGColorRef properly

ARC only handles Objective C objects so a CGColorRef needs to be
released explicitly.

xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc