This version is able to build against latest xorg git (including xinput
changes for MPX). It incoperates many concepts stolen from xf86-input-evdev.
I'm not sure about *BSD support, but from what I understood psmcomm is only
used on *BSD whild eventcomm is only used on Linux. So I enabled the build
of these only on the given operating system. Also fix some minor issues that
are related to the old build system (VERSION_ID related).