Allow the sched_yield, __thrsleep, __thrwakeup, and __threxit syscalls when using tame(2).  This allows threaded programs to work.
Allow the sched_yield, __thrsleep, __thrwakeup, and __threxit syscalls
when using tame(2).  This allows threaded programs to work.

OK deraadt@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars