[Toybox] [PATCH] reboot/halt/poweroff: add -d.

[enh]

busybox has a -d that delays before proceeding. Annoyingly systemd also
has a -d, but that's to disable writing a wtmp shutdown entry.

Also switch to using FLAG().
---
 toys/other/reboot.c | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)
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