Core/Entities: virtualize CheckAttackFitToAuraRequirement

- Should've been like this to begin with

(cherry picked from commit 21d95a1d767c95910d4508e0e83f34b4f89f587a)

src/server/game/Entities/Unit/Unit.h

@@ -1534,7 +1534,8 @@ class TC_GAME_API Unit : public WorldObject
 
         void UpdateUnitMod(UnitMods unitMod);
 
-        bool CheckAttackFitToAuraRequirement(WeaponAttackType attackType, AuraEffect const* aurEff) const;
+        // only players have item requirements
+        virtual bool CheckAttackFitToAuraRequirement(WeaponAttackType /*attackType*/, AuraEffect const* /*aurEff*/) const { return true; }
 
         virtual void UpdateDamageDoneMods(WeaponAttackType attackType);
         void UpdateAllDamageDoneMods();