Add several usability patches to nethack

Nethack.alt.org is widely seen as running the best version of Nethack
around, but high latency impacts the experience.  This commit alters
the version of nethack used by homebrew-games to incorporate the
patches used by nethack.alt.org.

New formula for an updated patch

Update SHA

Cleanup

Update comments
nethack: add 3.4.3 bottle.