build: switch to C++14

Change-Id: I7a32dad01e74ef5b7c5f37a5464d0b17a7882c61
Refs: #3076
diff --git a/daemon/table/pit-entry.hpp b/daemon/table/pit-entry.hpp
index c0fee00..2e49824 100644
--- a/daemon/table/pit-entry.hpp
+++ b/daemon/table/pit-entry.hpp
@@ -30,6 +30,8 @@
 #include "pit-out-record.hpp"
 #include "core/scheduler.hpp"
 
+#include <list>
+
 namespace nfd {
 
 namespace name_tree {