Core/Misc: Fix build warnings

src/server/scripts/Northrend/VioletHold/boss_ichoron.cpp

@@ -489,7 +489,7 @@ public:
 
         // on retail spell casted on a creature's death are not casted after death but keeping mob at 1 health, casting it and then letting the mob die.
         // this feature should be still implemented
-        void DamageTaken(Unit* attacker, uint32 &damage) override
+        void DamageTaken(Unit* /*attacker*/, uint32 &damage) override
         {
             int32 actualHp = me->GetHealth();
             actualHp -= damage;