[Bug 740012] gl: support opengl3+ core contexts

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=740012
  GStreamer | gst-plugins-bad | git

--- Comment #5 from Aurélien Zanelli <aurelien.zanelli at parrot.com> 2014-11-27 23:00:46 UTC ---
Created an attachment (id=291688)
 View: https://bugzilla.gnome.org/attachment.cgi?id=291688
 Review: https://bugzilla.gnome.org/review?bug=740012&attachment=291688

gldisplay: return GST_GL_API_NONE if display is not a GL_DISPLAY

These commits break compilation with fatal warnings due to return with no value
on a non-void function.

This commit fix it by returning GST_GL_API_NONE.

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