Add cd image mount options for platforms that need it

[Carl Paulino]

Refer to this forum page: http://forums.launchbox-app.com/topic/33114-retroarch/?page=6#comment-201276

in order to get ssh emulator and saturn to work, you have to create and use a batch file to run the games from LB. i think such LB can easily include a setting or two for image mounting in the gui somewhere. down with the batch file! ;P