[issue26516] Add PYTHONMALLOC env var and add support for malloc debug hooks in release mode

[STINNER Victor]

STINNER Victor added the comment:

The motivation to support PYTHONMALLOC=malloc (always use malloc) and not just PYTHONMALLOC=debug (enable debug hooks) is to allow to use external memory debugger like Valgrind.

Valgrind doesn't like pymalloc (pymalloc raises false alarms), we had to a configuration option for it: ./configure --with-valgrind.

Using PYTHONMALLOC=malloc allows to use Valgrind on the system Python, it's easier to use. No need to recompile Python.

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