vdpau: check for GL_NV_vdpau_interop in open
dvdplayer: only disable SD mpeg2 for DXVA, seem vaapi and vdpau are ok

Partial revert of: f02ac98fe8851aac15245792b9798813fbd06c1a
Merge pull request #3460 from FernetMenta/vdpau

vdpau: check for GL_NV_vdpau_interop in open