[Toybox] [PATCH] Implement uptime -s.

[enh]

Also add trivial tests.
---
 tests/uptime.test   | 10 ++++++++++
 toys/other/uptime.c | 32 ++++++++++++++++++++++----------
 2 files changed, 32 insertions(+), 10 deletions(-)
 create mode 100644 tests/uptime.test
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