Is this system an Android?

Property definitions

sdl2 $ SDLSysWMInfo :: is_android
	# Is this system an Android?
	fun is_android: Bool `{
		#if SDL_VERSION_ATLEAST(2, 0, 4)
			return self->subsystem == SDL_SYSWM_ANDROID;
		#else
			return 0;
		#endif
	`}
lib/sdl2/syswm.nit:93,2--100,3