src: minor updates to common.hpp and common-pch.hpp

Also remove redundant includes.

Change-Id: I0e1f55abcf852b95a4fd8c9a0e3a30aa153f892c
diff --git a/tests/unit-tests/util/sqlite3-statement.t.cpp b/tests/unit-tests/util/sqlite3-statement.t.cpp
index b440f7a..78e8664 100644
--- a/tests/unit-tests/util/sqlite3-statement.t.cpp
+++ b/tests/unit-tests/util/sqlite3-statement.t.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2013-2016 Regents of the University of California.
+ * Copyright (c) 2013-2017 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
  *
@@ -24,6 +24,7 @@
 #include "boost-test.hpp"
 
 #include <boost/filesystem.hpp>
+#include <cstring>
 #include <sqlite3.h>
 
 namespace ndn {