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

[STINNER Victor]

STINNER Victor added the comment:

New patch:

- replace "size_t size" with "size_t nelem, size_t elsize" in the prototype of calloc functions (the parameter names come from the POSIX standard)
- replace "int calloc" with "int zero" in helper functions

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Added file: http://bugs.python.org/file34903/calloc-2.patch

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<http://bugs.python.org/issue21233>
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