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, 3 insertions, 3 deletions

diff --git a/Modules/_posixsubprocess.c b/Modules/_posixsubprocess.c
index 80bb44d..2aed79e 100644
--- a/Modules/_posixsubprocess.c
+++ b/Modules/_posixsubprocess.c
@@ -80,7 +80,7 @@ _enable_gc(int need_to_reenable_gc, PyObject *gc_module)
 
     if (need_to_reenable_gc) {
         PyErr_Fetch(&exctype, &val, &tb);
-        result = _PyObject_CallMethodNoArgs(
+        result = PyObject_CallMethodNoArgs(
             gc_module, _posixsubprocessstate_global->enable);
         if (exctype != NULL) {
             PyErr_Restore(exctype, val, tb);
@@ -657,7 +657,7 @@ subprocess_fork_exec(PyObject* self, PyObject *args)
         gc_module = PyImport_ImportModule("gc");
         if (gc_module == NULL)
             return NULL;
-        result = _PyObject_CallMethodNoArgs(
+        result = PyObject_CallMethodNoArgs(
             gc_module, _posixsubprocessstate_global->isenabled);
         if (result == NULL) {
             Py_DECREF(gc_module);
@@ -669,7 +669,7 @@ subprocess_fork_exec(PyObject* self, PyObject *args)
             Py_DECREF(gc_module);
             return NULL;
         }
-        result = _PyObject_CallMethodNoArgs(
+        result = PyObject_CallMethodNoArgs(
             gc_module, _posixsubprocessstate_global->disable);
         if (result == NULL) {
             Py_DECREF(gc_module);