common: remove DECL_FINAL/OVERRIDE macros; use C++11 keywords directly

Change-Id: I71a148b0df7c95387b2caa8e2b9fe93b03ca2399
Refs: #3599
diff --git a/daemon/fw/retx-suppression-exponential.hpp b/daemon/fw/retx-suppression-exponential.hpp
index 4909417..a2fbe7b 100644
--- a/daemon/fw/retx-suppression-exponential.hpp
+++ b/daemon/fw/retx-suppression-exponential.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2014-2015,  Regents of the University of California,
+ * Copyright (c) 2014-2016,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -54,7 +54,7 @@
    */
   virtual Result
   decide(const Face& inFace, const Interest& interest,
-         pit::Entry& pitEntry) const DECL_OVERRIDE;
+         pit::Entry& pitEntry) const override;
 
 public:
   /** \brief StrategyInfo on pit::Entry