glapi: verify that aliased functions don't have entries in dispatch tables

Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33634>

src/mapi/glapi/gen/gl_XML.py

@@ -651,6 +651,8 @@ class gl_function( gl_item ):
 
         if alias:
             true_name = alias
+            if name in static_data.offsets:
+                raise RuntimeError("Aliased entry-point %s shouldn't be in static_data.py." % (name))
         else:
             true_name = name