Backported VDPAU up to upstream svn #20658.

Fixes include:

* Fix motion detection in the OpenGL kernel deinterlacer. This will stop flickering in static areas, though it is now more susceptible to noise.

Patch is available at:

http://www.avenard.org/files/media/vdpau/mythtv-fixes-glvdpau20658.patch.gz