[python] fix std unordered containers

Lib/python/std_unordered_multimap.i

@@ -74,7 +74,7 @@
 }
 
 %define %swig_unordered_multimap_methods(Type...) 
-  %swig_map_common(Type);
+  %swig_unordered_map_common(Type);
   %extend {
     void __setitem__(const key_type& key, const mapped_type& x) throw (std::out_of_range) {
       self->insert(Type::value_type(key,x));