Fixed a problem found by Bill Janssen on Mac OS X

There was one occurence of PyInt_FromLong left in Parser/asdl_c.py. The files creates some C code.

Parser/asdl_c.py

@@ -469,7 +469,7 @@ static PyObject* ast2obj_object(void *o)
 
 static PyObject* ast2obj_int(long b)
 {
-    return PyInt_FromLong(b);
+    return PyLong_FromLong(b);
 }
 """, 0, reflow=False)