[issue36656] Add race-free os.link and os.symlink wrapper / helper

[Yonatan Goldschmidt]

Change by Yonatan Goldschmidt <yon.goldschmidt at gmail.com>:


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nosy: +Yonatan Goldschmidt

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36656>
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