Add unity build support

src/Nazara/Core/AntiX11.hpp

@@ -0,0 +1,10 @@
+// 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
+
+#ifndef _X11_XLIB_H_
+#error This header should only be included after including X11/Xlib.h directly or indirectly in a .cpp
+#endif
+
+#undef Bool
+#undef None