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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #12 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 331475
  --> https://bugzilla.gnome.org/attachment.cgi?id=331475&action=edit
vaapi: instantiate a VA display when registering

This patch tries to instantiate a GstVaapiDisplay when registering the plugin
features, if it fails, no gstreamer-vaapi element is registering.

The purpose of this patch is to avoid a situation where the user has
gstreamer-vaapi installed but their VA-API setup is not functional, which may
lead to unexpected behavior.

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