[issue31368] Add os.preadv() and os.pwritev()

[YoSTEALTH]

YoSTEALTH <ritesh at stealthcentral.com> added the comment:

I can't at the moment, i am out of country for couple more months.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31368>
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