[Libva] vdpau-driver: fix build with <GL/glext.h> version >= 85

[Holger Kaelberer]

Hi,

pls port gst-vaapi commit 5db2e93d3c930fd8470cfdcd26f514d1cebc59a0 to vdpau-driver to make it build 
with recent mesa.

Thanks, regards,
   Holger
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