minor whitespace fix

Android.mk

@@ -177,7 +177,7 @@ typedef enum
     SDL_DISPLAYEVENT_NONE,          /**< Never used */
     SDL_DISPLAYEVENT_ORIENTATION,   /**< Display orientation has changed to data1 */
     SDL_DISPLAYEVENT_CONNECTED,     /**< Display has been added to the system */
-    SDL_DISPLAYEVENT_DISCONNECTED  /**< Display has been removed from the system */
+    SDL_DISPLAYEVENT_DISCONNECTED   /**< Display has been removed from the system */
 } SDL_DisplayEventID;
 
 typedef enum