[issue17180] shutil copy* unsafe on POSIX - they preserve setuid/setgit bits

[Giampaolo Rodola']

Change by Giampaolo Rodola' <g.rodola at gmail.com>:


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nosy: +giampaolo.rodola

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue17180>
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