build: switch to C++14

Change-Id: I7a32dad01e74ef5b7c5f37a5464d0b17a7882c61
Refs: #3076
diff --git a/daemon/table/cs-policy-priority-fifo.hpp b/daemon/table/cs-policy-priority-fifo.hpp
index 4ac5a63..a914891 100644
--- a/daemon/table/cs-policy-priority-fifo.hpp
+++ b/daemon/table/cs-policy-priority-fifo.hpp
@@ -29,6 +29,8 @@
 #include "cs-policy.hpp"
 #include "core/scheduler.hpp"
 
+#include <list>
+
 namespace nfd {
 namespace cs {
 namespace priority_fifo {