SDL_EVENT_QUIT when no window nor tray

SDL_HINT_QUIT_ON_LAST_WINDOW_CLOSE will not fire if there are active tray icons. This impacts only applications that create tray icons, and that at least one icon outlives the last visible top-level window. SDL_EVENT_QUIT will fire when the last active tray is destroyed if there are no active windows.

Android.mk

@@ -79,6 +79,7 @@ LOCAL_SRC_FILES := \
 	$(wildcard $(LOCAL_PATH)/src/timer/*.c) \
 	$(wildcard $(LOCAL_PATH)/src/timer/unix/*.c) \
 	$(wildcard $(LOCAL_PATH)/src/tray/dummy/*.c) \
+	$(wildcard $(LOCAL_PATH)/src/tray/*.c) \
 	$(wildcard $(LOCAL_PATH)/src/video/*.c) \
 	$(wildcard $(LOCAL_PATH)/src/video/android/*.c) \
 	$(wildcard $(LOCAL_PATH)/src/video/yuv2rgb/*.c))