Fixed the standalone build of the package against ROOT 6.08/00 (TrigNavStructure-00-00-25)

	* Added a missing include in StandaloneNavigation.cxx that
	  became an issue when building against ROOT v6-08-00.
	* Tagging as TrigNavStructure-00-00-25


Former-commit-id: 78ef1f82

Trigger/TrigEvent/TrigNavStructure/Root/StandaloneNavigation.cxx

@@ -2,6 +2,10 @@
   Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
 */
 
+
+// System include(s):
+#include <iostream>
+
 #include "TrigNavStructure/StandaloneNavigation.h"
 #include "TrigNavStructure/TypelessHolder.h"