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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Ping. My suggestion is to rename _PY_ONCEVAR_INIT to _Py_SET_ONCE and make it returning the value. And apply this to more static and global variables.

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