Drop bf_getbuffer/bf_releasebuffer from stable ABI,

see #10181.

Include/typeslots.h

-#define Py_bf_getbuffer 1
-#define Py_bf_releasebuffer 2
+/* Do not renumber the file; these numbers are part of the stable ABI. */
+/* Disabled, see #10181 */
+#undef Py_bf_getbuffer
+#undef Py_bf_releasebuffer
 #define Py_mp_ass_subscript 3
 #define Py_mp_length 4
 #define Py_mp_subscript 5

Objects/typeslots.inc

-/* Generated by typeslots.py $Revision: 87011 $ */
-offsetof(PyHeapTypeObject, as_buffer.bf_getbuffer),
-offsetof(PyHeapTypeObject, as_buffer.bf_releasebuffer),
+/* Generated by typeslots.py $Revision: 87806 $ */
+0,
+0,
 offsetof(PyHeapTypeObject, as_mapping.mp_ass_subscript),
 offsetof(PyHeapTypeObject, as_mapping.mp_length),
 offsetof(PyHeapTypeObject, as_mapping.mp_subscript),