Fix compiler warning unused function 'register_unlink'.
@@ -2221,7 +2221,7 @@ register_dirty_segment(SMgrRelation reln, MdMirVec *seg)
* As with register_dirty_segment, this could involve either a local or
* a remote pending-ops table.
*/
-static void
+static void pg_attribute_unused()
register_unlink(RelFileNode rnode)
{
if (pendingOpsTable)
