[PATCH] Add wtmp and -w option to halt

[Roy Marples]

Hi List

Gentoo currently uses halt -w to record a system shutdown action in wtmp
but not actually shut the system down at this point. Attached is a patch
that enables this for busybox halt. If this patch is not accepted, then
please consider silently accepting the -w option so a Gentoo shutdown is
a bit cleaner using busybox.

sysvinit halt also has the -d option, which means "Don't write a wtmp
record", however this conflicts with busybox where -d means delay. This
patch does not address this. Maybe there should be a shutdown applet
with the delay option to mirror sysvinit and BSD instead.

Thanks

Roy
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