Make the semantics of the P_SUGIDEXEC flag match the issetugid(2) man page.  Instead of just clearing P_SUGIDEXEC if real and effective uids/gids matched, we now set P_SUGIDEXEC if there is a mismatch in the real, effective, or saved uid/gid and clear it otherwise. deraadt@ and tholo@ OK.
Make the semantics of the P_SUGIDEXEC flag match the issetugid(2)
man page.  Instead of just clearing P_SUGIDEXEC if real and effective
uids/gids matched, we now set P_SUGIDEXEC if there is a mismatch in
the real, effective, or saved uid/gid and clear it otherwise.
deraadt@ and tholo@ OK.

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