build: == Dependency change ==  NFD now depends on ndn-cxx library

Change-Id: Ia9dd324a536573b5ac4fe1b73d82af772dc84923
Refs: #1536
diff --git a/core/face-monitor.cpp b/core/face-monitor.cpp
index 658d4b9..914e3df 100644
--- a/core/face-monitor.cpp
+++ b/core/face-monitor.cpp
@@ -26,7 +26,7 @@
 #include "face-monitor.hpp"
 #include "core/logger.hpp"
 
-#include <ndn-cpp-dev/face.hpp>
+#include <ndn-cxx/face.hpp>
 
 namespace nfd {