[Bug 746012] gl: add GstGLDisplayCocoa to handle NSApp initialization

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=746012

--- Comment #2 from Julien Isorce <julien.isorce at gmail.com> ---
I forgot to mention that I removed the handling of g_source_remove because it
is safe to call the callback at any time. So let the gmaincontext remove it.

Also I realized I should return NULL in gstgldisplay.c if it fails to create
GstGLDisplay. Instead of falling back to dummy display. And check more properly
this case.

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