[issue13380] ctypes: add an internal function for reseting the ctypes caches

[Meador Inge]

Meador Inge <meadori at gmail.com> added the comment:

> - you duplicated the part with "CFUNCTYPE(c_int)(lambda: None)" without 
> removing the original chunk of code
> - some platforms can't compile ctypes, you must handle that case in 
> regrtest

Both fixed.  Thanks for the review.  Second patch attached.

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Added file: http://bugs.python.org/file23689/ctypes-reset-cache-2.patch

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