Run Argument Clinic: METH_VARARGS=>METH_FASTCALL

Issue #29286. Run Argument Clinic to get the new faster METH_FASTCALL calling
convention for functions using "boring" positional arguments.

Manually fix _elementtree: _elementtree_XMLParser_doctype() must remain
consistent with the clinic code.
diff --git a/Objects/clinic/bytesobject.c.h b/Objects/clinic/bytesobject.c.h
index 330cb84..c73b560 100644
--- a/Objects/clinic/bytesobject.c.h
+++ b/Objects/clinic/bytesobject.c.h
@@ -184,22 +184,26 @@
 "If the argument is omitted or None, strip leading and trailing ASCII whitespace.");
 
 #define BYTES_STRIP_METHODDEF    \
-    {"strip", (PyCFunction)bytes_strip, METH_VARARGS, bytes_strip__doc__},
+    {"strip", (PyCFunction)bytes_strip, METH_FASTCALL, bytes_strip__doc__},
 
 static PyObject *
 bytes_strip_impl(PyBytesObject *self, PyObject *bytes);
 
 static PyObject *
-bytes_strip(PyBytesObject *self, PyObject *args)
+bytes_strip(PyBytesObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     PyObject *bytes = Py_None;
 
-    if (!PyArg_UnpackTuple(args, "strip",
+    if (!_PyArg_UnpackStack(args, nargs, "strip",
         0, 1,
         &bytes)) {
         goto exit;
     }
+
+    if (!_PyArg_NoStackKeywords("strip", kwnames)) {
+        goto exit;
+    }
     return_value = bytes_strip_impl(self, bytes);
 
 exit:
@@ -215,22 +219,26 @@
 "If the argument is omitted or None, strip leading  ASCII whitespace.");
 
 #define BYTES_LSTRIP_METHODDEF    \
-    {"lstrip", (PyCFunction)bytes_lstrip, METH_VARARGS, bytes_lstrip__doc__},
+    {"lstrip", (PyCFunction)bytes_lstrip, METH_FASTCALL, bytes_lstrip__doc__},
 
 static PyObject *
 bytes_lstrip_impl(PyBytesObject *self, PyObject *bytes);
 
 static PyObject *
-bytes_lstrip(PyBytesObject *self, PyObject *args)
+bytes_lstrip(PyBytesObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     PyObject *bytes = Py_None;
 
-    if (!PyArg_UnpackTuple(args, "lstrip",
+    if (!_PyArg_UnpackStack(args, nargs, "lstrip",
         0, 1,
         &bytes)) {
         goto exit;
     }
+
+    if (!_PyArg_NoStackKeywords("lstrip", kwnames)) {
+        goto exit;
+    }
     return_value = bytes_lstrip_impl(self, bytes);
 
 exit:
@@ -246,22 +254,26 @@
 "If the argument is omitted or None, strip trailing ASCII whitespace.");
 
 #define BYTES_RSTRIP_METHODDEF    \
-    {"rstrip", (PyCFunction)bytes_rstrip, METH_VARARGS, bytes_rstrip__doc__},
+    {"rstrip", (PyCFunction)bytes_rstrip, METH_FASTCALL, bytes_rstrip__doc__},
 
 static PyObject *
 bytes_rstrip_impl(PyBytesObject *self, PyObject *bytes);
 
 static PyObject *
-bytes_rstrip(PyBytesObject *self, PyObject *args)
+bytes_rstrip(PyBytesObject *self, PyObject **args, Py_ssize_t nargs, PyObject *kwnames)
 {
     PyObject *return_value = NULL;
     PyObject *bytes = Py_None;
 
-    if (!PyArg_UnpackTuple(args, "rstrip",
+    if (!_PyArg_UnpackStack(args, nargs, "rstrip",
         0, 1,
         &bytes)) {
         goto exit;
     }
+
+    if (!_PyArg_NoStackKeywords("rstrip", kwnames)) {
+        goto exit;
+    }
     return_value = bytes_rstrip_impl(self, bytes);
 
 exit:
@@ -507,4 +519,4 @@
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=2b8d3cff7e11045e input=a9049054013a1b77]*/
+/*[clinic end generated code: output=2504c1225108d348 input=a9049054013a1b77]*/