Change #include style

Header files are now always included with their path from the
project's root directory rather than the path relative to
the includer.

Change-Id: If39b8510eef8da00baf5fe88337c45dbdf8c766e
Refs: #3084
diff --git a/tests/unit/version.t.cpp b/tests/unit/version.t.cpp
index 7fdb50d..61a701c 100644
--- a/tests/unit/version.t.cpp
+++ b/tests/unit/version.t.cpp
@@ -19,10 +19,10 @@
  * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
  */
 
-#include "version.hpp"
-#include "common.hpp"
+#include "ndn-cxx/version.hpp"
+#include "ndn-cxx/common.hpp"
 
-#include "boost-test.hpp"
+#include "tests/boost-test.hpp"
 
 #include <stdio.h>