[issue44582] Accelerate mimetypes.init on Windows

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

mimetypes doesn't _really_ support clearing, but `python.exe -m timeit "import mimetypes as M; M.types_map.clear(); M.init()"` is pretty close.

Without the accelerator: 133ms
With the accelerator: 27.8ms

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<https://bugs.python.org/issue44582>
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