GLX: Set GlxServerExports::{major,minor}Version

Commit 56c0a71f incremented the
GLXSERVER_VENDOR_ABI_MINOR_VERSION define, but this define was not actually
being used to set glxServer.minorVersion.

Update the initializer for glxServer to use the correct version numbers.

Signed-off-by: Aaron Plattner <aplattner@nvidia.com>
(cherry picked from commit b4231d69)
3 jobs for server-1.20-branch in 5 minutes and 49 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Docker Image
passed #412411
debian-testing

00:00:34

 
  Build And Test
passed #412412
autotools-build-and-test

00:05:14

passed #412413
meson-build-and-test

00:01:10