[issue37129] Add os.RWF_APPEND flag for os.pwritev

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

YoSTEALTH, are you both allowed and willing to do so? The patch is not completely trivial and you seem to have the needed knowledge.  (I don't.)

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<https://bugs.python.org/issue37129>
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