ZipFile.__del__() when there was an IOError opening the underlying
    file in ZipFile.__init__().

    This is an odd test: since the exception is in the __del__() method,
    it is not propogated.  This test will trigger it but regrtest.py
    does not detect the failure (not sure why); we are dependent on it
    actually being noticed by a user to get a new bug report if it ever
    fails.  ;-(

    On the other hand, this makes sure that code gets exercised, so
    a failure could be noticed!