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

[Stefan Krah]

Stefan Krah added the comment:

Hmm, obmalloc.c changed as well, so already the gcc optimizer can take
different paths and produce different results.

Also I did set mpd_callocfunc to PyMem_Calloc(). 2% slowdown is far
from being a tragic result, so I guess we can ignore that.

The bytes() speedup is very nice. Allocations that took one second
are practically instant now.

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