[issue37194] Move new vector private declarations to the internal C API

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

I used testcapi_call_no_args.patch and stack_overflow-4.py to measure the stack consumption of PyObject_CallNoArgs() and PyObject_CallFunctionObjArgs() for PR 13890.

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Added file: https://bugs.python.org/file48401/testcapi_call_no_args.patch

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