build fix

src/server/game/AI/PlayerAI/PlayerAI.h

@@ -54,7 +54,7 @@ class SimpleCharmedPlayerAI : public PlayerAI
         SimpleCharmedPlayerAI(Player* player) : PlayerAI(player) { }
         void UpdateAI(uint32 diff) override;
         void OnCharmed(bool apply) override;
-        Unit* SelectAttackTarget() const;
+        Unit* SelectAttackTarget() const override;
 };
 
 #endif