Update for EnTT 3.9

src/Nazara/Core/ECS.cpp

@@ -1,11 +0,0 @@
-// Copyright (C) 2022 Jérôme "Lynix" Leclercq (lynix680@gmail.com)
-// This file is part of the "Nazara Engine - Core module"
-// For conditions of distribution and use, see copyright notice in Config.hpp
-
-#include <Nazara/Core/ECS.hpp>
-#include <Nazara/Core/Debug.hpp>
-
-namespace Nz
-{
-	NAZARA_CORE_API ECS* ECS::s_instance = nullptr;
-}