GLX: Bump the GLXVND major version number.

Bump the GLXVND interface version, since it's had some backwards-incompatible
changes.
3 jobs for GLX_EXT_server_vendor_select in 5 minutes and 25 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Docker Image
passed #280471
debian-testing

00:00:14

 
  Build And Test
passed #280472
autotools-build-and-test

00:05:10

passed #280473
meson-build-and-test

00:01:21