build: Update build scripts

Change-Id: Ifad7ff5004a4dede8beec348e9920453fc74449d
diff --git a/tools/ndns-dig.cpp b/tools/ndns-dig.cpp
index 30afe88..bbe5ad3 100644
--- a/tools/ndns-dig.cpp
+++ b/tools/ndns-dig.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2014, Regents of the University of California.
+ * Copyright (c) 2014-2016, Regents of the University of California.
  *
  * This file is part of NDNS (Named Data Networking Domain Name Service).
  * See AUTHORS.md for complete list of NDNS authors and contributors.
@@ -183,7 +183,7 @@
     m_interestLifetime = lifetime;
   }
 
-  const bool
+  bool
   hasError() const
   {
     return m_hasError;