plugins: retry to create the VA display
plugins: retry to create the VA display

Particularly in GNOME Wayland, the negotiated or created GL context
defines a GLX environment, but VAAPI fails to create a GLX VA
display because there is no a DRI2 connection.

This patch retries to create the VA display if VA cannot create one
with the GL context parameters. Now using the old list of display
types.

This should also work in the case of systems with two GPU, when the
non-VAAPI has the graphics environment, and the VAAPI-enabled one
shall work headless.

https://bugzilla.gnome.org/show_bug.cgi?id=772838

ceyusa/gstreamer-vaapi,GStreamer/gstreamer-vaapi,GStreamer/gstreamer-vaapi,ceyusa/gstreamer-vaapi