Rename _PyIter_GetBuiltin to _PyObject_GetBuiltin, and do not include it in the stable ABI.
diff --git a/Modules/arraymodule.c b/Modules/arraymodule.c
index af5d183..b0921c8 100644
--- a/Modules/arraymodule.c
+++ b/Modules/arraymodule.c
@@ -2756,7 +2756,7 @@
 static PyObject *
 arrayiter_reduce(arrayiterobject *it)
 {
-    return Py_BuildValue("N(O)n", _PyIter_GetBuiltin("iter"),
+    return Py_BuildValue("N(O)n", _PyObject_GetBuiltin("iter"),
                          it->ao, it->index);
 }