[Toybox] [PATCH 2/2] killall: implement -w.

[enh]

This isn't currently used in AOSP, but it is used in some of the other
codebases I can easily search, and it's a better fix for test flakiness
than inserting a sleep.
---
 tests/killall.test |  4 ++--
 toys/lsb/killall.c | 25 +++++++++++++++++++++++--
 2 files changed, 25 insertions(+), 4 deletions(-)
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