build: Make app visible to non-touchscreen devices (e.g. M.O.J.O).

Technically a pointing device is still needed in a few parts, but those
will be disappearing soon in version 3.  Want mupen to be visible for
the holidays :)

The elements that still require pointing device as of version 2.4.2:
 - enable/disable controllers (toggle switch)
 - map multiple players (popup with buttons)
 - cheats menus (possibly, can't remember)