[Bug 729245] gl: rename platform cocoa to cgl to be more consistent with context type

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=729245
  GStreamer | gst-plugins-bad | git

--- Comment #1 from Julien Isorce <julien.isorce at gmail.com> 2014-05-06 07:57:38 UTC ---
if that make sense to do this change, I think this bug should be marked as
blocker

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