Get rid of most of the flags (in tp_flags) that keep track of various
variations of the type struct and its attachments.  In Py3k, all type
structs have to have all fields -- no binary backwards compatibility.
Had to change the complex object to a new-style number!
diff --git a/Include/abstract.h b/Include/abstract.h
index d4bd588..1e69614 100644
--- a/Include/abstract.h
+++ b/Include/abstract.h
@@ -534,8 +534,7 @@
 	is an iterator, this returns itself. */
 
 #define PyIter_Check(obj) \
-    (PyType_HasFeature((obj)->ob_type, Py_TPFLAGS_HAVE_ITER) && \
-     (obj)->ob_type->tp_iternext != NULL)
+    ((obj)->ob_type->tp_iternext != NULL)
 
      PyAPI_FUNC(PyObject *) PyIter_Next(PyObject *);
      /* Takes an iterator object and calls its tp_iternext slot,