[Bug 764673] blacklist unsupported backend drivers

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764673

--- Comment #8 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
And setcaps will fail? It's not ideal, no :) Better fail as early as possible,
e.g. during the state change.

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