[Toybox] [PATCH] Basic success/failure return from pgrep/pkill.

[enh]

The man page says they also return 2 for syntax errors and 3 for "fatal
error: out of memory etc", but I don't know how to implement that and
don't need it (or have any reason to believe anyone needs it).

Bug: 29092208
---
 tests/pgrep.test |  4 ++++
 tests/pkill.test | 10 ++++++++--
 toys/posix/ps.c  |  8 +++++++-
 3 files changed, 19 insertions(+), 3 deletions(-)
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