[issue37483] Add PyObject_CallOneArg()

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

This change doesn't make caller code complicated.  It makes caller little simpler.

Choosing performance sensitive code is much hard than replace all occurrences.
So I'm OK to change all callers except code owner opposed at once.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37483>
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