[Toybox] [PATCH] Fix setlocale() calls on macOS.

[enh]

This reverts part of 75b89012c90470a27d66b54ad89901b94fcfd169.
Always supporting UTF-8 is a good idea, but you need to be careful
how you try to do that on macOS. The previous comment obviously
didn't suffice to make that clear, so I've been a bit more verbose
this time.

This fixes multiple existing tests.
---
 main.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)
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