[issue28915] Modify PyObject_CallFunction() to use fast call internally

[Roundup Robot]

Roundup Robot added the comment:

New changeset fa9933bf4ea0 by Serhiy Storchaka in branch 'default':
Issue #28915: Exclude _Py_VaBuildStack from the limited API.
https://hg.python.org/cpython/rev/fa9933bf4ea0

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