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/Modules/clinic/_tracemalloc.c.h b/Modules/clinic/_tracemalloc.c.h
index b53fa3e..df7b750 100644
--- a/Modules/clinic/_tracemalloc.c.h
+++ b/Modules/clinic/_tracemalloc.c.h
@@ -90,15 +90,11 @@
 _tracemalloc_start_impl(PyObject *module, Py_ssize_t nframe);
 
 static PyObject *
-_tracemalloc_start(PyObject *module, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
+_tracemalloc_start(PyObject *module, PyObject **args, Py_ssize_t nargs)
 {
     PyObject *return_value = NULL;
     Py_ssize_t nframe = 1;
 
-    if (!_PyArg_NoStackKeywords("start", kwnames)) {
-        goto exit;
-    }
-
     if (!_PyArg_ParseStack(args, nargs, "|n:start",
         &nframe)) {
         goto exit;
@@ -189,4 +185,4 @@
 {
     return _tracemalloc_get_traced_memory_impl(module);
 }
-/*[clinic end generated code: output=ca7b197d1bdcdf27 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=c9a0111391b3ec45 input=a9049054013a1b77]*/