Fix dunnet when played on terminals which don't support UTF-8

* lisp/play/dunnet.el (dun-rooms, dun-endgame-question, dun-help)
(dun-physobj-desc, dun-endgame-questions): Don't use non-ASCII
characters.  (Bug#79520)

lisp/play/dunnet.el

@@ -149,8 +149,8 @@ kept.  The exit is to the west."
 "You are in a computer room.  It seems like most of the equipment has
 been removed.  There is a VAX 11/780 in front of you, however, with
 one of the cabinets wide open.  A sign on the front of the machine
-says: This VAX is named ‘pokey’.  To type on the console, use the
+says: This VAX is named 'pokey'.  To type on the console, use the
-‘type’ command.  The exit is to the east."
+'type' command.  The exit is to the east."
                "Computer room"
 	       )
 	      (
@@ -160,7 +160,7 @@ to the west, and a door leads to the south."
 	       )
 	      (
 "You are in a round, stone room with a door to the east.  There
-is a sign on the wall that reads: ‘receiving room’."
+is a sign on the wall that reads: 'receiving room'."
                "Receiving room"
 	       )
 	      (
@@ -237,7 +237,7 @@ northeast through the brush you can see the bear hangout."
 	      (
 "The entrance to a cave is to the south.  To the north, a road leads
 towards a deep lake.  On the ground nearby there is a chute, with a sign
-that says ‘put treasures here for points’."
+that says 'put treasures here for points'."
                "Cave Entrance"                      ;28
 	       )
 	      (
@@ -516,13 +516,13 @@ starvation.  Doors lead out to the south and east."
 	       )
 	      (
 "You are in some sort of maintenance room for the museum.  There is a
-switch on the wall labeled ‘BL’.  There are doors to the west and north."
+switch on the wall labeled 'BL'.  There are doors to the west and north."
                "Maintenance room"                   ;87
 	       )
 	      (
 "You are in a classroom where school children were taught about natural
-history.  On the blackboard is written, ‘No children allowed downstairs.’
+history.  On the blackboard is written, 'No children allowed downstairs.'
-There is a door to the east with an ‘exit’ sign on it.  There is another
+There is a door to the east with an 'exit' sign on it.  There is another
 door to the west."
                "Classroom"                          ;88
 	       )
@@ -556,7 +556,7 @@ a room to the northeast."
 	      (
 "You are in another computer room.  There is a computer in here larger
 than you have ever seen.  It has no manufacturers name on it, but it
-does have a sign that says: This machine's name is ‘endgame’.  The
+does have a sign that says: This machine's name is 'endgame'.  The
 exit is to the southwest.  There is no console here on which you could
 type."
                "Endgame computer room"         ;95
@@ -567,7 +567,7 @@ type."
 	       )
 	      (
 "You have reached a question room.  You must answer a question correctly in
-order to get by.  Use the ‘answer’ command to answer the question."
+order to get by.  Use the 'answer' command to answer the question."
                "Question room 1"              ;97
 	       )
 	      (
@@ -598,7 +598,7 @@ a hallway leads to the south."
 	      (
 "You have reached a dead end.  There is a PC on the floor here.  Above
 it is a sign that reads:
-          Type the ‘reset’ command to type on the PC.
+          Type the 'reset' command to type on the PC.
 A hole leads north."
                "PC area"                       ;104
                )
@@ -1020,8 +1020,8 @@ the inventory.")
 2 Megabytes of RAM onboard."
 "It looks like some kind of meat.  Smells pretty bad."
 nil
-"The paper says: Don't forget to type ‘help’ for help.  Also, remember
+"The paper says: Don't forget to type 'help' for help.  Also, remember
-this word: ‘worms’"
+this word: 'worms'"
 "The statuette is of the likeness of Richard Stallman, the author of the
 famous EMACS editor.  You notice that he is not wearing any shoes."
 nil
@@ -1064,10 +1064,10 @@ pipes into nowhere.  The hole is too small for a person to fit in.  The
 flush handle is so clean that you can see your reflection in it."
 nil nil
 "The box has a slit in the top of it, and on it, in sloppy handwriting, is
-written: ‘For key upgrade, put key in here.’"
+written: 'For key upgrade, put key in here.'"
 nil
-"It says ‘express mail’ on it."
+"It says 'express mail' on it."
-"It is a 35 passenger bus with the company name ‘mobytours’ on it."
+"It is a 35 passenger bus with the company name 'mobytours' on it."
 "It is a large metal gate that is too big to climb over."
 "It is a HIGH cliff."
 "Unfortunately you do not know enough about dinosaurs to tell very much about
@@ -1099,11 +1099,11 @@ nil nil nil nil
     (setq a (+ a 1))))
 
 (defconst dun-endgame-questions
-  '(("What is your password on the machine called ‘pokey’?" "robert")
+  '(("What is your password on the machine called 'pokey'?" "robert")
     ("What password did you use during anonymous ftp to gamma?" "foo")
     ("Excluding the endgame, how many places are there where you can put
 treasures for points?" "4" "four")
-    ("What is your login name on the ‘endgame’ machine?" "toukmond")
+    ("What is your login name on the 'endgame' machine?" "toukmond")
     ("What is the nearest whole dollar to the price of the shovel?"
      "20" "twenty")
     ("What is the name of the bus company serving the town?" "mobytours")
@@ -1945,7 +1945,7 @@ to swim.")
     (dun-mprincl " endgame points out of a possible 110.")
     (if (= (dun-endgame-score) 110)
 	(dun-mprincl
-"\n\nCongratulations.  You have won.  The wizard password is ‘moby’"))))
+"\n\nCongratulations.  You have won.  The wizard password is 'moby'"))))
 
 (defun dun-help (_args)
   (dun-mprincl
@@ -1953,7 +1953,7 @@ to swim.")
 Here is some useful information (read carefully because there are one
 or more clues in here):
 - If you have a key that can open a door, you do not need to explicitly
-  open it.  You may just use ‘in’ or walk in the direction of the door.
+  open it.  You may just use 'in' or walk in the direction of the door.
 
 - If you have a lamp, it is always lit.
 
@@ -1967,8 +1967,8 @@ or more clues in here):
   If this happens, your score will decrease, and in many cases you can never
   get credit for it again.
 
-- You can save your game with the ‘save’ command, and restore it
+- You can save your game with the 'save' command, and restore it
-  with the ‘restore’ command.
+  with the 'restore' command.
 
 - There are no limits on lengths of object names.
 
@@ -2102,7 +2102,7 @@ for a moment, then straighten yourself up.\n")
     (if (null questions)
         (progn
           (dun-mprincl "Your question is:")
-          (dun-mprincl "No more questions, just do ‘answer foo’.")
+          (dun-mprincl "No more questions, just do 'answer foo'.")
           (setq dun-correct-answer '("foo")))
       (let* ((which (random (length questions)))
              (question (nth which questions)))