Fixed denial-of-weak-ref-support test; Jeremy changed the error message

used by the weakref code since he didn't like the word "referencable".
Is it really necessary to be more specific than to test for TypeError here,
though?

Lib/test/test_descr.py

@@ -1374,7 +1374,7 @@ def weakrefs():
     try:
         weakref.ref(no)
     except TypeError, msg:
-        verify(str(msg).find("weakly") >= 0)
+        verify(str(msg).find("weak reference") >= 0)
     else:
         verify(0, "weakref.ref(no) should be illegal")
     class Weak(object):