[issue17405] Add _Py_memset_s() to securely clear memory

[Christian Heimes]

Christian Heimes added the comment:

mlock() can prevent swapping but it may need extra capabilities. A working memset_s() removes critical information from core dumps at least.

If we don't want to add _Py_memset_s() then I'm going to remove the dysfunctional clearstate macro from my sha3 module.

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nosy: +gregory.p.smith

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<http://bugs.python.org/issue17405>
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