[issue23102] distutils: isinstance checks fail with setuptools-monkeypatched Extension/Distribution

[Greg Turner]

Greg Turner added the comment:

Here's the same deal more-or-less for issue 23114... this time I expended considerably less effort verifying that it's not a bad idea.  At a glance, though, it looks fine, and solved an instance of the issue 23114 problem I was able to repro on my box.

Patch context reduced so as to be applicable to all three pythons in one go.

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Added file: http://bugs.python.org/file37554/distutils_accomodate_distribution_ducktypes.patch

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