[issue29881] Add a new private API clear private variables, which are initialized once, at Python shutdown

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I agree with your rationale Nick, but _Py_SET_FINALIZED is a little too long and highlight only the second function of the macro. I don't have good name.

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<http://bugs.python.org/issue29881>
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