[issue17405] Add _Py_memset_s() to securely clear memory

[Christian Heimes]

Christian Heimes added the comment:

I don't have enough time to work in this issue before 3.4 beta1.

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versions: +Python 3.5 -Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17405>
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