It this window manager Wayland?

Property definitions

sdl2 $ SDLSysWMInfo :: is_wayland
	# It this window manager Wayland?
	fun is_wayland: Bool `{
		#if SDL_VERSION_ATLEAST(2, 0, 2)
			return self->subsystem == SDL_SYSWM_WAYLAND;
		#else
			return 0;
		#endif
	`}
lib/sdl2/syswm.nit:66,2--73,3