[Bug 724352] Plugin should not register if underlaying library not available

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=724352

--- Comment #7 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 330561
  --> https://bugzilla.gnome.org/attachment.cgi?id=330561&action=edit
vaapi: register according to a test VA display

In order to register only the available elements, this patch creates a test VA
display, using the currently used back-end (X11, Wayland, DRM, …) on the used
display device, it is queried and given the response the available feature set
in plugin are registered.

This patch depends on a patch in bug 734093 (vaapidecode: allow for per-codec
element split) which completes the codec split.

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