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 8 minutes and 2 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Docker Image
passed debian-testing #502539

00:00:36

 
  Build And Test
passed autotools-build-and-test #502540

00:07:25

passed meson-build-and-test #502541

00:01:08