Log Message:
lang/racket: fix build on NetBSD.

* Package uses terminfo, so include "mk/terminfo.buildlink3.mk".
* Patch to not require ncurses on NetBSD. Builds fine with netbsd-curses
  and apparently doesn't require extra features.
* Replace all instances of `-lncurses` with `-lcurses -lterminfo` in
  patch files.
* Replace "devel/ncurses/buildlink3.mk" with \ 
"mk/curses.buildlink3.mk"
  in Makefile to reflect above change.
* Bump revision.

Tested on NetBSD-10.0_BETA/amd64.