[issue27932] platform.win32_ver() leaks in 2.7.12

[STINNER Victor]

STINNER Victor added the comment:

> pointer-type cache grows without bound

Maybe we should also fix ctypes to use an LRU cache like
@functools.lru_cache? A cache without limit doesn't seem like a good
idea.

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<http://bugs.python.org/issue27932>
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