[Toybox] [PATCH] macOS: add a timer_create() and timer_settimer() to fix the build.

[enh]

Note that these aren't equivalent to the CLOCK_MONOTONIC timer we
have on Linux, but short of spinning up another thread ourselves I
can't see how to implement that on macOS at present.

---
 lib/portability.c | 24 ++++++++++++++++++++++++
 lib/portability.h | 10 ++++++++++
 2 files changed, 34 insertions(+)
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