Revert "gh-106023: Update What's New in 3.13: _PyObject_FastCall() (#117633)" by vstinner · Pull Request #117676 · python/cpython
(Contributed by Victor Stinner in :gh:`105182`.)
* Remove private ``_PyObject_FastCall()`` function: use ``PyObject_Vectorcall()`` which is available since Python 3.8 (:pep:`590`). (Contributed by Victor Stinner in :gh:`106023`.)
* Remove ``cpython/pytime.h`` header file: it only contained private functions. (Contributed by Victor Stinner in :gh:`106316`.)