[issue21233] Add *Calloc functions to CPython memory allocation API

[STINNER Victor]

STINNER Victor added the comment:

> There is no need to hurry.

I changed my mind :-p It should be easier for numpy to test the development version of Python.

Let's wait for buildbots.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21233>
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