[Toybox] [PATCH] timeout: fix exit status for sneaky subprocesses.

[enh]

There's nothing to stop a subprocess from catching our SIGTERM on timeout
and exiting, causing us to incorrectly report that it didn't time out.
Android's ART has a utility that does exactly this.

Explicitly catch this case, and add corresponding tests.

Bug: http://b/141007616
---
 tests/timeout.test   | 15 +++++++++++++++
 toys/other/timeout.c |  5 +++++
 2 files changed, 20 insertions(+)
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