[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

Julien Isorce <julien.isorce> changed:

           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |ASSIGNED
     Ever Confirmed|0                           |1

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