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/lp/nack-header.t.cpp b/tests/unit/lp/nack-header.t.cpp
index 0645f40..4670608 100644
--- a/tests/unit/lp/nack-header.t.cpp
+++ b/tests/unit/lp/nack-header.t.cpp
@@ -21,9 +21,9 @@
  * @author Eric Newberry <enewberry@email.arizona.edu>
  */
 
-#include "lp/nack-header.hpp"
+#include "ndn-cxx/lp/nack-header.hpp"
 
-#include "boost-test.hpp"
+#include "tests/boost-test.hpp"
 
 namespace ndn {
 namespace lp {