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/floatobject.c.h b/Objects/clinic/floatobject.c.h
index 893629b..9325154 100644
--- a/Objects/clinic/floatobject.c.h
+++ b/Objects/clinic/floatobject.c.h
@@ -53,15 +53,11 @@
 float___round___impl(PyObject *self, PyObject *o_ndigits);
 
 static PyObject *
-float___round__(PyObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
+float___round__(PyObject *self, PyObject **args, Py_ssize_t nargs)
 {
     PyObject *return_value = NULL;
     PyObject *o_ndigits = NULL;
 
-    if (!_PyArg_NoStackKeywords("__round__", kwnames)) {
-        goto exit;
-    }
-
     if (!_PyArg_UnpackStack(args, nargs, "__round__",
         0, 1,
         &o_ndigits)) {
@@ -267,16 +263,12 @@
                           const char *fmt);
 
 static PyObject *
-float___set_format__(PyTypeObject *type, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
+float___set_format__(PyTypeObject *type, PyObject **args, Py_ssize_t nargs)
 {
     PyObject *return_value = NULL;
     const char *typestr;
     const char *fmt;
 
-    if (!_PyArg_NoStackKeywords("__set_format__", kwnames)) {
-        goto exit;
-    }
-
     if (!_PyArg_ParseStack(args, nargs, "ss:__set_format__",
         &typestr, &fmt)) {
         goto exit;
@@ -313,4 +305,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=b2271e7413b36162 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=90c06ea9d72130cc input=a9049054013a1b77]*/