Core/Misc: Fix C++17 build errors

(cherry picked from commit 30823f9b79b4ad16f96e90692a900f68a7f63c0a)

src/server/game/Loot/LootMgr.cpp

@@ -54,7 +54,7 @@ LootStore LootTemplates_Skinning("skinning_loot_template",           "creature s
 LootStore LootTemplates_Spell("spell_loot_template",                 "spell id (random item creating)", false);
 
 // Selects invalid loot items to be removed from group possible entries (before rolling)
-struct LootGroupInvalidSelector : public std::unary_function<LootStoreItem*, bool>
+struct LootGroupInvalidSelector
 {
     explicit LootGroupInvalidSelector(Loot const& loot, uint16 lootMode) : _loot(loot), _lootMode(lootMode) { }
 

src/server/scripts/EasternKingdoms/BaradinHold/boss_occuthar.cpp

@@ -205,7 +205,7 @@ class npc_eyestalk : public CreatureScript
         }
 };
 
-class FocusedFireTargetSelector : public std::unary_function<Unit *, bool>
+class FocusedFireTargetSelector
 {
     public:
         FocusedFireTargetSelector(Creature* me, const Unit* victim) : _me(me), _victim(victim) { }

src/server/scripts/EasternKingdoms/ZulGurub/boss_mandokir.cpp

@@ -548,7 +548,7 @@ class spell_mandokir_spirit_vengeance_cancel : public SpellScriptLoader
         }
 };
 
-class DevastatingSlamTargetSelector : public std::unary_function<Unit *, bool>
+class DevastatingSlamTargetSelector
 {
     public:
         DevastatingSlamTargetSelector(Creature* me, const Unit* victim) : _me(me), _victim(victim) {}

src/server/scripts/Northrend/CrusadersColiseum/TrialOfTheChampion/boss_argent_challenge.cpp

@@ -112,7 +112,7 @@ enum Spells
     SPELL_WAKING_NIGHTMARE_H    = 67677
 };
 
-class OrientationCheck : public std::unary_function<Unit*, bool>
+class OrientationCheck
 {
     public:
         explicit OrientationCheck(Unit* _caster) : caster(_caster) { }

src/server/scripts/Northrend/IcecrownCitadel/boss_lord_marrowgar.cpp

@@ -103,7 +103,7 @@ enum Actions
     ACTION_TALK_ENTER_ZONE        = 2
 };
 
-class BoneSpikeTargetSelector : public std::unary_function<Unit*, bool>
+class BoneSpikeTargetSelector
 {
     public:
         BoneSpikeTargetSelector(UnitAI* ai) : _ai(ai) { }

src/server/scripts/Northrend/IcecrownCitadel/boss_the_lich_king.cpp

@@ -362,7 +362,7 @@ enum Misc
     DATA_VILE                   = 45814622
 };
 
-class NecroticPlagueTargetCheck : public std::unary_function<Unit*, bool>
+class NecroticPlagueTargetCheck
 {
     public:
         NecroticPlagueTargetCheck(Unit const* obj, uint32 notAura1 = 0, uint32 notAura2 = 0)

src/server/scripts/Northrend/IcecrownCitadel/boss_valithria_dreamwalker.cpp

@@ -157,7 +157,7 @@ enum Misc
 
 Position const ValithriaSpawnPos = {4210.813f, 2484.443f, 364.9558f, 0.01745329f};
 
-struct ManaVoidSelector : public std::unary_function<Unit*, bool>
+struct ManaVoidSelector
 {
         explicit ManaVoidSelector(WorldObject const* source) : _source(source) { }
 

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

@@ -197,7 +197,7 @@ class KelThuzadCharmedPlayerAI : public SimpleCharmedPlayerAI
         }
 };
 
-struct ManaUserTargetSelector : public std::unary_function<Unit*, bool>
+struct ManaUserTargetSelector
 {
     bool operator()(Unit const* target) const
     {

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

@@ -72,7 +72,7 @@ enum Events
 
 const float WEB_WRAP_MOVE_SPEED = 20.0f;
 
-struct WebTargetSelector : public std::unary_function<Unit*, bool>
+struct WebTargetSelector
 {
     WebTargetSelector(Unit* maexxna) : _maexxna(maexxna) {}
     bool operator()(Unit const* target) const

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

@@ -362,7 +362,7 @@ class spell_ulduar_rubble_summon : public SpellScriptLoader
 };
 
 // predicate function to select non main tank target
-class StoneGripTargetSelector : public std::unary_function<Unit*, bool>
+class StoneGripTargetSelector
 {
     public:
         StoneGripTargetSelector(Creature* me, Unit const* victim) : _me(me), _victim(victim) { }

src/server/scripts/Outland/BlackTemple/boss_illidan.cpp

@@ -450,7 +450,7 @@ private:
     Unit* _owner;
 };
 
-class ChargeTargetSelector : public std::unary_function<Unit*, bool>
+class ChargeTargetSelector
 {
 public:
     ChargeTargetSelector() { }

src/server/scripts/Outland/BlackTemple/boss_illidari_council.cpp

@@ -295,7 +295,7 @@ private:
     uint32 _bossId;
 };
 
-class HammerTargetSelector : public std::unary_function<Unit*, bool>
+class HammerTargetSelector
 {
 public:
     HammerTargetSelector(Unit const* unit) : _me(unit) { }