kibbiee's hardware is still around, but it's not worth making it
build anymore.  remove the configuration files.

Reference: /n/atom/patch/applied2013/retirekibbiee
Date: Mon Aug 26 02:13:19 CES 2013
Signed-off-by: quanstro@quanstro.net

# rm /sys/src/fs/kibbiee/conf
# rm /sys/src/fs/kibbiee/conf.build
# rm /sys/src/fs/kibbiee/dat.h
# rm /sys/src/fs/kibbiee/etherctlr.c
# rm /sys/src/fs/kibbiee/etherctlr.h
# rm /sys/src/fs/kibbiee/kibbiee.c
# rm /sys/src/fs/kibbiee/mkfile