remove arena cooldowns and auras methods for mangos zero

UnitMethods.h

@@ -2657,6 +2657,7 @@ namespace LuaUnit
         return 0;
     }
 
+#if !defined(CLASSIC)
     /**
      * Removes all positive visible [Aura]'s from the [Unit].
      */
@@ -2665,6 +2666,7 @@ namespace LuaUnit
         unit->RemoveArenaAuras();
         return 0;
     }
+#endif
 
     /**
      * Adds the given unit state for the [Unit].