Scripts: Add missing overrides.

(cherry picked from commit aac868a6d9)

src/server/scripts/Northrend/Naxxramas/boss_gluth.cpp

@@ -332,7 +332,7 @@ public:
             OnEffectHit += SpellEffectFn(spell_gluth_decimate_SpellScript::HandleEvent, EFFECT_2, SPELL_EFFECT_SEND_EVENT);
         }
 
-        bool Load()
+        bool Load() override
         {
             return GetCaster() && GetCaster()->GetEntry() == NPC_GLUTH;
         }
@@ -366,7 +366,7 @@ public:
             AfterHit += SpellHitFn(spell_gluth_zombiechow_search_SpellScript::HealForEachTargetHit);
         }
 
-        bool Load()
+        bool Load() override
         {
             return GetCaster() && GetCaster()->GetEntry() == NPC_GLUTH;
         }

src/server/scripts/Outland/CoilfangReservoir/TheSlavePens/instance_the_slave_pens.cpp

@@ -81,7 +81,7 @@ public:
             }
         }
 
-        void SetGuidData(uint32 data, ObjectGuid guid)
+        void SetGuidData(uint32 data, ObjectGuid guid) override
         {
             switch (data)
             {