Mark unused arguments and remove unused variables

Mark unused arguments and remove unused variables

* lisp/play/dunnet.el (dun-mode, dun-die, dun-inven, dun-try-take):
(dun-dig, dun-type, dun-n, dun-s, dun-e, dun-w, dun-ne, dun-se):
(dun-nw, dun-sw, dun-up, dun-down, dun-in, dun-out, dun-long):
(dun-swim, dun-score, dun-flush, dun-piss, dun-sleep, dun-drive):
(dun-superb, dun-power, dun-unix-parse, dun-bin, dun-fascii):
(dun-ftpquit, dun-ftphelp, dun-uexit, dun-pwd, dun-dos-parse):
(dun-dos-invd, dun-dos-spawn, dun-dos-exit, dun-dos-nil):
(dungeon-nil): Mark arguments as unused.
(dun-drop, dun-objnum-from-args, dun-get-path, dun-ftp):
(dun-restore): Remove unused variable.