[issue32569] Blake2 module, memory clearance update

[David Carlier]

New submission from David Carlier <dcarlier at afilias.info>:

Might brings a bit of "controversy" but some oses have already unoptimizable memset like functions from their libc was thinking to just use them instead.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32569>
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