tzset() is unconditionally defined in libs/libc/time/lib_localtime.c,
but its prototype in <time.h> is gated behind CONFIG_LIBC_LOCALTIME --
without it, Toybox's own tzset() calls (lib/xwrap.c, toys/posix/date.c)
compile as implicit declarations instead. The stm32f4discovery:toybox
defconfig already carries this option (see its own commit message);
sim:toybox's was simply missing it.
Signed-off-by: Alan C. Assis <acassis@gmail.com>
Assisted-by: Claude Sonnet 5 <noreply@anthropic.com>
36bcebb9c4