games/nlarn: update 0.7.3 to 0.7.6

• patch applied with changes;
• this port now uses 'localbase' and 'ncurses:port'
• build fine for 12, 13 and 14.
  
  RELEASE NOTES
• https://nlarn.github.io/news/2020/05/23/release-0.7.6

Reported by: Alex <r7st.guru % gmail.com>
PR: 257088