Rename _PyIter_GetBuiltin to _PyObject_GetBuiltin, and do not include it in the stable ABI.
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index aee832a..1d8a176 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -14386,13 +14386,13 @@
 unicodeiter_reduce(unicodeiterobject *it)
 {
     if (it->it_seq != NULL) {
-        return Py_BuildValue("N(O)n", _PyIter_GetBuiltin("iter"),
+        return Py_BuildValue("N(O)n", _PyObject_GetBuiltin("iter"),
                              it->it_seq, it->it_index);
     } else {
         PyObject *u = PyUnicode_FromUnicode(NULL, 0);
         if (u == NULL)
             return NULL;
-        return Py_BuildValue("N(N)", _PyIter_GetBuiltin("iter"), u);
+        return Py_BuildValue("N(N)", _PyObject_GetBuiltin("iter"), u);
     }
 }