xwayland/glamor: Add GLVND vendor to xwl_screen

Merged Olivier Fourdan requested to merge ofourdan/xserver:xwayland-eglstream-glvnd into master

If Xwayland's EGLstream backend supports hardware acceleration with the NVIDIA closed-source driver, the GLX library also needs to be one shipped by NVIDIA, that's what GLVND is for.

Add a new hook to the GLAMOR Xwayland API to query the GLVND vendor to use from the GLAMOR Xwayland backend.

Signed-off-by: Olivier Fourdan ofourdan@redhat.com

Edited by Olivier Fourdan

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