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

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Two things:
- 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

Otherwise, good idea.

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nosy: +pitrou

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<http://bugs.python.org/issue13380>
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