* other/boot/: moved
got rio a bit working :) just run rio, and then at least the right menu works!
* sys/src/cmd/rio/rio.c: works again! no more segfault
had to modify kencc too
* rc/bin/riostart: restore
* sys/src/cmd/rio/rio.c: keep the Exit menu
* compile.sh:
* rc/bin/dircp:
* sys/src/9/boot/local.c: simplifiy
* sys/src/9/boot/boot.c: rio now works!!
* sys/src/9/pc/pcf:
* sys/src/9/pc/pcf: