Add PyDescr_IsData to the limited API

Author: Erlend E. Aasland

Include/descrobject.h

@@ -93,6 +93,9 @@ PyAPI_FUNC(PyObject *) PyDescr_NewGetSet(PyTypeObject *,
 #ifndef Py_LIMITED_API
 PyAPI_FUNC(PyObject *) PyDescr_NewWrapper(PyTypeObject *,
                                                 struct wrapperbase *, void *);
+#endif
+
+#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x030A0000
 PyAPI_FUNC(int) PyDescr_IsData(PyObject *);
 #endif
 

Misc/NEWS.d/next/Core and Builtins/2021-02-15-13-41-14.bpo-40170.r2FAtl.rst

@@ -1,3 +1,3 @@
 Convert :c:func:`PyDescr_IsData` macro to a function to hide implementation
 details: The macro accessed :c:member:`PyTypeObject.tp_descr_set` directly.
-Patch by Erlend E. Aasland.
+The function is now a part of the limited C API. Patch by Erlend E. Aasland.