Disable a test that is unreliable.

Lib/ctypes/test/test_python_api.py

 from ctypes import *
 import unittest, sys
+from ctypes.test import is_resource_enabled
 
 ################################################################
 # This section should be moved into ctypes\__init__.py, when it's ready.
@@ -33,6 +34,10 @@ class PythonAPITestCase(unittest.TestCase):
         del pyob
         self.failUnlessEqual(grc(s), refcnt)
 
+    if is_resource_enabled("refcount"):
+        # This test is unreliable, because it is possible that code in
+        # unittest changes the refcount of the '42' integer.  So, it
+        # is disabled by default.
         def test_PyInt_Long(self):
             ref42 = grc(42)
             pythonapi.PyInt_FromLong.restype = py_object