Fix some issues when using the EPG with VDPAU ; few Xlib errors and could fail to re-init VDPAU.

From upstream:

Don't re-draw the VDPAU colour key when embedding. This should fix some Xlib errors when using the EPG.

Changeset 20263

Other fixes added to MythTV trunk like using software decoder should VDPAU fail to start haven’t been backported.

http://www.avenard.org/files/media/vdpau/mythtv-fixes-glvdpau20263.patch.gz