Simply cansignal(), passing it processes instead of procs and dropping the pcred argument.  Fix handling of kill(-1, sig) from a thread other than the original thread.
Simply cansignal(), passing it processes instead of procs and
dropping the pcred argument.  Fix handling of kill(-1, sig) from a
thread other than the original thread.

ok deraadt@

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