wrong signature in a few overrides

src/server/scripts/Kalimdor/CavernsOfTime/DarkPortal/instance_dark_portal.cpp

@@ -116,9 +116,9 @@ public:
             DoUpdateWorldState(WORLD_STATE_BM_RIFT, 0);
         }
 
-        bool IsEncounterInProgress()
+        bool IsEncounterInProgress() const
         {
-            if (GetData(TYPE_MEDIVH) == IN_PROGRESS)
+            if (const_cast<instance_dark_portal_InstanceMapScript*>(this)->GetData(TYPE_MEDIVH) == IN_PROGRESS)
                 return true;
 
             return false;

src/server/scripts/Northrend/CrusadersColiseum/TrialOfTheCrusader/boss_twin_valkyr.cpp

@@ -759,7 +759,7 @@ class spell_powering_up : public SpellScriptLoader
 
             uint32 spellId;
 
-            bool Validate(SpellEntry const* /*spellEntry*/)
+            bool Validate(SpellInfo const* /*spellEntry*/)
             {
                 spellId = sSpellMgr->GetSpellIdForDifficulty(SPELL_SURGE_OF_SPEED, GetCaster());
                 if (!sSpellMgr->GetSpellInfo(spellId))

src/server/scripts/Northrend/Ulduar/Ulduar/boss_flame_leviathan.cpp

@@ -1273,7 +1273,7 @@ class go_ulduar_tower : public GameObjectScript
     public:
         go_ulduar_tower() : GameObjectScript("go_ulduar_tower") { }
 
-        void OnDestroyed(GameObject* go, Player* /*player*/,  uint32 /*value*/)
+        void OnDestroyed(GameObject* go, Player* /*player*/)
         {
             InstanceScript* instance = go->GetInstanceScript();
             if (!instance)