removed old input driver and bsd_bell.c failing with WSCONS on NetBSD

[Jeremy C. Reed]

I think this is related to 3eeb62e8f587732e6b433c2b9c6879eb26a3f1b4

The errors:

bsd_bell.c:31:22: error: sys/kbio.h: No such file or directory
bsd_bell.c: In function 'xf86OSRingBell':
bsd_bell.c:80: error: 'xf86InfoRec' has no member named 'kbdFd'
bsd_bell.c:80: error: 'xf86InfoRec' has no member named 'kbdFd'

As far as I see kbio.h is for sun, alpha, sparc64, sun2, sparc, x68k 
systems on NetBSD. In fact, I don't think they are used at all on NetBSD. 
It is not included for i386.

Also the kbdFd definitions were removed from Xorg's source.

Where is it documented on how to re-add support?