[issue18520] Fixes bugs found by pyfailmalloc during Python initialization

[STINNER Victor]

STINNER Victor added the comment:

> Victor, could you look at the end of #10241?  Starting from 31796b188bec,
> many values in _PySys_Init() have 2 references. Why is that required?

It was a mistake, it should now be fixed. Nice catch.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18520>
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