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gh-106320: Move private _PySet API to the internal API (#107041)

* Add pycore_setobject.h header file.
* Move the following API to the internal C API:

  * _PySet_Dummy
  * _PySet_NextEntry()
  * _PySet_Update()
V
Victor Stinner committed
5e4af2a3e90d78fdf6a4cc42e0472576b1f2b975
Parent: c92ef6f
Committed by GitHub <noreply@github.com> on 7/22/2023, 3:04:34 PM