x11/xterm: update to 368

Patch #368 - 2021/06/07
-add DefaultOff option to RenderFont resource, as part of the session-management
feature.
-add auto-scroll-lock feature (patch by add Stelios Bounanos).
-update the window-size information returned via TIOCGWINSZ when rows/columns
are unchanged but the font-size changes (report by Nick Black).
-improve session-management feature by saving/restoring the font settings.
-update config.guess, config.sub

(pin)