thrd_sleep, mtx_timedlock, and cnd_timedwait take a struct timespec,
whose layout follows time_t. libmingwex.a was compiled for 32-bit
time_t only, so x86 programs built with 64-bit time_t read garbage
timeouts. The plain names keep the 32-bit ABI so existing objects still
link correctly, and threads.h redirects 64-bit time_t callers to new
*64 variants. x64 is unchanged.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
