Message 113956 - Python tracker

It breaks test_unicode_file on OS X, too:

  File "/Users/db3l/buildarea/3.x.bolen-tiger/build/Lib/test/test_unicode_file.py", line 8, in <module>
    from test.support import (run_unittest, rmtree,
ImportError: cannot import name TESTFN_UNENCODABLE