gh-134989: Implement PyObject_DelAttr() as a macro in the limited C API

Author: vstinner

Include/abstract.h

@@ -147,7 +147,12 @@ extern "C" {
 
    Delete attribute named attr_name, for object o. Returns -1
    on failure.  This is the equivalent of the Python
-   statement: del o.attr_name. */
+   statement: del o.attr_name.
+
+   Implemented as a macro in the limited C API 3.12 and older. */
+#if defined(Py_LIMITED_API) && Py_LIMITED_API+0 < 0x030d0000
+#  define PyObject_DelAttr(O, A) PyObject_SetAttr((O), (A), NULL)
+#endif
 
 
 /* Implemented elsewhere:

Misc/NEWS.d/next/C_API/2025-06-02-13-19-22.gh-issue-134989.sDDyBN.rst

@@ -0,0 +1,2 @@
+Implement :c:func:`PyObject_DelAttr` as a macro in the limited C API 3.12
+and older. Patch by Victor Stinner.