[issue21518] Expose RegUnloadKey in winreg

[eryksun]

eryksun added the comment:

ctypes LibraryLoader instances cache CDLL/WinDLL instances, which cache function pointers. Using the global ctypes.cdll and ctypes.windll loaders can lead to conflicting definitions for restype, argtypes, and errcheck. I suggest using a private LibraryLoader in windows_helper, e.g.:

    windll = ctypes.LibraryLoader(ctypes.WinDLL)

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nosy: +eryksun

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<http://bugs.python.org/issue21518>
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