xwayland/glamor: Add GLVND vendor to xwl_screen
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