[Toybox] Subject: [PATCH] kill: allow `kill -0` for testing process existence.

[enh]

Allow num_to_sig(0) so kill doesn't disallow -0 because it can't
round-trip, and then teach list_signals() to avoid the special case of
signal 0 rather than assume that all the signals it shouldn't print
don't have names now signal 0 has the name "0".
---
 lib/lib.c         | 2 +-
 lib/portability.c | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)
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