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

sys.builtin_module_names.  (Noticed by Toby Dickenson.)

Modules/config.c.in

@@ -37,6 +37,7 @@ struct _inittab _PyImport_Inittab[] = {
 	{"__main__", NULL},
 	{"__builtin__", NULL},
 	{"sys", NULL},
+	{"exceptions", NULL},
 
 	/* Sentinel */
 	{0, 0}