nixgl: preserve __functionArgs when forwarding .override

Forwarding `.override` calls strips the attached metadata, which leads to unexpected behavior in some modules.

Closes #9494

modules/targets/generic-linux/nixgl.nix

@@ -303,7 +303,9 @@ in
             # wouldn't know what to do with them. So, we rewrite the override
             # function to instead forward the arguments to the package's own
             # override function.
-            override = args: makePackageWrapper vendor environment (pkg.override args);
+            override = lib.setFunctionArgs (args: makePackageWrapper vendor environment (pkg.override args)) (
+              lib.functionArgs (pkg.override or (_: { }))
+            );
           };
 
       # Note, if you add/remove/alter attribute names here you need to make a