fix anoher warning

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@6255 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Lib/python/pywstrings.swg

@@ -123,7 +123,7 @@ SWIG_AsWCharArray(PyObject *obj, wchar_t *val, size_t size)
   if (val) {
     PyErr_Format(PyExc_TypeError, 
 		 "a wchar_t array of maximum size %lud is expected", 
-		 size);
+		 (unsigned long) size);
   }
   return 0;
 }