Fixed Missing #include<functional>

server/combat/barrier_manager.hpp

@@ -27,6 +27,7 @@
 #include "sqlite3.h"
 
 #include <algorithm>
+#include <functional>
 #include <list>
 #include <map>
 

server/combat/combat_instance.hpp

@@ -24,6 +24,8 @@
 #include "character_data.hpp"
 #include "creature_data.hpp"
 
+#include <functional>
+
 class CombatInstance {
 public:
 	CombatInstance();