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

[STINNER Victor]

STINNER Victor added the comment:

"And http://www.eglibc.org/cgi-bin/viewvc.cgi/trunk/libc/malloc/malloc.c?view=markup
to check that calloc(nelem, elsize) is implemented as calloc(nelem *
elsize)"

__libc_calloc() starts with a check on integer overflow.

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