fw: add override specifier to Strategy triggers

refs #2281

Change-Id: I5357ac6a93260492900d24c8955fdd7397ef2d27
diff --git a/daemon/fw/best-route-strategy2.hpp b/daemon/fw/best-route-strategy2.hpp
index 72df544..bb259d0 100644
--- a/daemon/fw/best-route-strategy2.hpp
+++ b/daemon/fw/best-route-strategy2.hpp
@@ -48,7 +48,7 @@
   afterReceiveInterest(const Face& inFace,
                        const Interest& interest,
                        shared_ptr<fib::Entry> fibEntry,
-                       shared_ptr<pit::Entry> pitEntry);
+                       shared_ptr<pit::Entry> pitEntry) DECL_OVERRIDE;
 
 public:
   static const Name STRATEGY_NAME;