[Toybox] [PATCH] portability.c: fix macOS build.

[enh]

I suspect the rest of the non-POSIX signals might end up like this,
but this is the subset that needs to be #ifdef'ed to fix the macOS
build.
---
 lib/portability.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)
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