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