daemon: add missing include

Change-Id: I169e1c9e911bf298cd415746b58fda4c4290c931
diff --git a/daemon/main.cpp b/daemon/main.cpp
index 8a236ab..47f7333 100644
--- a/daemon/main.cpp
+++ b/daemon/main.cpp
@@ -47,6 +47,7 @@
 #include <thread>
 
 #include <ndn-cxx/util/logging.hpp>
+#include <ndn-cxx/util/ostream-joiner.hpp>
 #include <ndn-cxx/version.hpp>
 
 #ifdef HAVE_LIBPCAP