bug#17714: 24.4.50; File coding system not detected correctly

[Jorgen Schaefer]

Since a few days ago, current trunk stopped detecting file coding
systems correctly for me. For a file that is opened as utf-8 with stable
Emacs, it now says (using emacs -q, fundamental-mode):

-----
buffer-file-coding-system is a variable defined in `C source code'.
Its value is no-conversion
Local in buffer Todo; global value is utf-8-unix
-----

M-x revert-buffer-with-coding-system RET utf-8 RET works fine.


Configured using:
 `configure --without-x'

Configured features:
SOUND NOTIFY LIBXML2 ZLIB

Important settings:
  value of $LC_ALL: 
  value of $LC_COLLATE: de_DE.UTF-8
  value of $LC_CTYPE: de_DE.UTF-8
  value of $LC_MESSAGES: POSIX
  value of $LC_MONETARY: POSIX
  value of $LC_NUMERIC: POSIX
  value of $LC_TIME: POSIX
  value of $LANG: POSIX
  locale-coding-system: utf-8-unix