Is this system a Windows RT?

Property definitions

sdl2 $ SDLSysWMInfo :: is_winrt
	# Is this system a Windows RT?
	fun is_winrt: Bool `{
		#if SDL_VERSION_ATLEAST(2, 0, 3)
			return self->subsystem == SDL_SYSWM_WINRT;
		#else
			return 0;
		#endif
	`}
lib/sdl2/syswm.nit:84,2--91,3