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 7 minutes and 47 seconds (queued for 27 seconds)
Status Job ID Name Coverage
  Docker Image
passed #341233
debian-testing

00:00:41

 
  Build And Test
passed #341234
autotools-build-and-test

00:06:37

passed #341235
meson-build-and-test

00:00:58