[Bug 782923] gl: Add Mesa3D GBM backend

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=782923
Bug 782923 depends on bug 782922, which changed state.

Bug 782922 Summary: build: Make gudev and libdrm checks reusable across plugins
https://bugzilla.gnome.org/show_bug.cgi?id=782922

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |OBSOLETE

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