bpo-39245: Switch to public API for Vectorcall (GH-18460)

The bulk of this patch was generated automatically with:

    for name in \
        PyObject_Vectorcall \
        Py_TPFLAGS_HAVE_VECTORCALL \
        PyObject_VectorcallMethod \
        PyVectorcall_Function \
        PyObject_CallOneArg \
        PyObject_CallMethodNoArgs \
        PyObject_CallMethodOneArg \
    ;
    do
        echo $name
        git grep -lwz _$name | xargs -0 sed -i "s/\b_$name\b/$name/g"
    done

    old=_PyObject_FastCallDict
    new=PyObject_VectorcallDict
    git grep -lwz $old | xargs -0 sed -i "s/\b$old\b/$new/g"

and then cleaned up:

- Revert changes to in docs & news
- Revert changes to backcompat defines in headers
- Nudge misaligned comments

1 files changed, 1 insertions, 1 deletions

diff --git a/Modules/gcmodule.c b/Modules/gcmodule.c
index 5673f60..cf164c1 100644
--- a/Modules/gcmodule.c
+++ b/Modules/gcmodule.c
@@ -872,7 +872,7 @@ handle_weakrefs(PyGC_Head *unreachable, PyGC_Head *old)
         _PyObject_ASSERT(op, callback != NULL);
 
         /* copy-paste of weakrefobject.c's handle_callback() */
-        temp = _PyObject_CallOneArg(callback, (PyObject *)wr);
+        temp = PyObject_CallOneArg(callback, (PyObject *)wr);
         if (temp == NULL)
             PyErr_WriteUnraisable(callback);
         else