bpo-29464: Rename METH_FASTCALL to METH_FASTCALL|METH_KEYWORDS and make (#1955)

the bare METH_FASTCALL be used for functions with positional-only
parameters.
diff --git a/Objects/clinic/tupleobject.c.h b/Objects/clinic/tupleobject.c.h
index a6eedff..c453e58 100644
--- a/Objects/clinic/tupleobject.c.h
+++ b/Objects/clinic/tupleobject.c.h
@@ -18,17 +18,13 @@
                  Py_ssize_t stop);
 
 static PyObject *
-tuple_index(PyTupleObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
+tuple_index(PyTupleObject *self, PyObject **args, Py_ssize_t nargs)
 {
     PyObject *return_value = NULL;
     PyObject *value;
     Py_ssize_t start = 0;
     Py_ssize_t stop = PY_SSIZE_T_MAX;
 
-    if (!_PyArg_NoStackKeywords("index", kwnames)) {
-        goto exit;
-    }
-
     if (!_PyArg_ParseStack(args, nargs, "O|O&O&:index",
         &value, _PyEval_SliceIndexNotNone, &start, _PyEval_SliceIndexNotNone, &stop)) {
         goto exit;
@@ -99,4 +95,4 @@
 {
     return tuple___getnewargs___impl(self);
 }
-/*[clinic end generated code: output=70b4de94a0002ec3 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=d24a9893b3a740c6 input=a9049054013a1b77]*/