wayland/input-event-codes: new port for wayland compat (bulk wanted)

Hi,

wayland/input-event-codes intents is to provide input-event-codes definition
from linux headers. Wayland defines several constants as "code as defined in the
Linux kernel's linux/input-event-codes.h header file".

This port exports linux/input-event-codes.h header (only comments and #define)
and linux/input.h (which only include the previous header).

including linux/input.h is the usual way to get input-event-codes definition.

Such headers is necessary to properly build some libraries or programs with
wayland support (without defining the constants like BTN_LEFT with patches).


The port itself is very simple, but the fallout to have ports picking
<linux/input.h> is somehow important.

If possible, I would like to have a bulk build with wayland/input-event-codes
installed, in order to see if the presence of linux/input.h header makes
problems or not.

Thanks.
--
Sebastien Marie