Otherwise autoconfig file can't be found on the Wii U:
VID/PID are not available, so it has to match with 'input_device' and I
don't want to add additional autoconfig files with different
'input_device' strings.
== DETAILS
The HID drivers in `input/connect/` were missing an implementation
for button(), so I added it. The only exception is the wii driver,
which is really complicated and more than I wanted to try to tackle--
especially since WIIU has its own wiimote drivers.
