Several termio emulation fixes.  The VMIN/VTTIME/EOF/EOL overlay is now handled.  Setting termio state now won't lose BSD state which SVR4 don't carry.  Kludge SVR4 TAB expansion support.
Several termio emulation fixes.  The VMIN/VTTIME/EOF/EOL overlay is now
handled.  Setting termio state now won't lose BSD state which SVR4 don't
carry.  Kludge SVR4 TAB expansion support.

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