Thread wait timeouts break on negative, NaN, huge and sub-millisecond values

POSIX Semaphore.tryAcquire builds a negative tv_nsec for negative or NaN timeouts and overflows (int) for large ones, so -0.5, NaN, 3e9 and 1e10 throw "Failed to wait for semaphore" (Windows returns false/true). It also reads errno after leaving the GC-free zone.
With a 32-bit time_t, WaitSeconds(3e9) overflows tv_sec and returns after microseconds, so Lock.wait spins at full CPU.
Windows truncates milliseconds instead of rounding up, so tryAcquire(0.0005) does not wait and Lock.wait busy-polls the last millisecond of every timed wait.

Fix thread wait timeouts for negative, NaN, huge and sub-millisecond …

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