Add "exceptions" to list of built-in modules for the sake of

sys.builtin_module_names.  (Noticed by Toby Dickenson.)

[Tim, please test!]

PC/config.c

@@ -117,6 +117,7 @@ struct _inittab _PyImport_Inittab[] = {
         {"__main__", NULL},
         {"__builtin__", NULL},
         {"sys", NULL},
+	{"exceptions", NULL},
 
         /* Sentinel */
         {0, 0}