[issue22060] Clean up ctypes.test, use unittest test discovery

[Zachary Ware]

Zachary Ware added the comment:

Done.  Thank you for the reviews, Serhiy (and my apologies about all the spam with bad patches earlier today).

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assignee:  -> zach.ware

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22060>
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