rusticl: call glsl_type_singleton_init_or_ref

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15439>

src/gallium/frontends/rusticl/api/device.rs

@@ -201,6 +201,9 @@ static mut DEVICES: Vec<Arc<Device>> = Vec::new();
 static INIT: Once = Once::new();
 
 fn load_devices() {
+    unsafe {
+        glsl_type_singleton_init_or_ref();
+    }
     Device::all()
         .into_iter()
         .for_each(|d| unsafe { DEVICES.push(d) });