taskWait() actually returns OK on timeout, so drop the timeout warning
(the other implementations don't have one).
The taskWait() may return ERROR with S_objLib_OBJ_ID_ERROR if the target
thread has higher priority; this indicates a successful join, because
we already did a rendezvous using joinSem.
Delete joinSem *after* calling taskSpareFieldSet(), in case it matters.
05e0381b19