bug#21946: 25.1.50; Saving games fails in dunnet

[Peder O. Klingenberg]

While plaing dunnet, saving games via the "save"-command fails with the
message "Error saving to file".  To reproduce:

$  ~/src/emacs/src/emacs -batch -l dunnet

Dead end
You are at a dead end of a dirt road.  The road goes to the east.
In the distance you can see that it will eventually fork off.  The
trees here are very tall royal palms, and they are spaced equidistant
from each other.
There is a shovel here.
>save /tmp/foo.txt
Error saving to file.
>

The reason is that dunnet uses its own implementation of ROT13 to
obfuscate the savefile, and this implementation breaks when it
encounters characters outside the 0-255 range.  On 2015-08-24, Paul
Eggert introduced some curly quotes in data normally saved to this
file.

Attached is a patch that makes dun-rot13 use rot13-region instead of its
own implementation.

0001-Fix-savegames-in-dunnet.patch
Description: Text Data

In GNU Emacs 25.1.50.1 (x86_64-apple-darwin14.5.0, NS appkit-1348.17 Version 
10.10.5 (Build 14F1021))
 of 2015-11-17
Repository revision: 58e6235007e6761fb9734b942ecff94bf4e9ba68
Windowing system distributor 'Apple', version 10.3.1348
Configured features:
RSVG DBUS ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS

Important settings:
  locale-coding-system: utf-8-unix

Major mode: Emacs-Lisp

Minor modes in effect:
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  shell-dirtrack-mode: t
  diff-auto-refine-mode: t
  linum-mode: t
  show-paren-mode: t
  paredit-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
Type C-c C-c to finish, or C-c C-k to cancel
Auto-saving...done
Auto-saving...done
Mark set
Saving file /Users/pok/src/emacs/.git/COMMIT_EDITMSG...
Wrote /Users/pok/src/emacs/.git/COMMIT_EDITMSG
Git finished [2 times]
Reverting (up to) 3 file-visiting buffer(s)...
(No buffers need to be reverted)
Type C-h i to view popup manual, ? to describe an argument or action. [2 times]

Load-path shadows:
./zone hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/zone
./tetris hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/tetris
./studly hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/studly
./spook hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/spook
./solitaire hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/solitaire
./snake hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/snake
./pong hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/pong
./mpuz hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/mpuz
./morse hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/morse
./life hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/life
./hanoi hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/hanoi
./handwrite hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/handwrite
./gomoku hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/gomoku
./gametree hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/gametree
./gamegrid hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/gamegrid
./fortune hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/fortune
./dunnet hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/dunnet
./doctor hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/doctor
./dissociate hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/dissociate
./decipher hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/decipher
./cookie1 hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/cookie1
./bubbles hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/bubbles
./blackbox hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/blackbox
./animate hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/animate
./5x5 hides 
/Users/pok/src/emacs/nextstep/Emacs.app/Contents/Resources/lisp/play/5x5

Features:
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Memory information:
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