bug#9794: 24.0.90; `format-time-string' no good for %Z

[Drew Adams]

emacs -Q
 
M-: (format-time-string "Started: %a %b %e %T %Y (%Z)" (current-time))
 
For me that produces this:
 
"Started: Tue Oct 18 23:40:28 2011 ()"
 
The %Z doesn't work at all.  This is a regression that started in Emacs
22.  In Emacs 20 and 21 (emacs -Q) it works correctly, displaying this:
 
"Started: Tue Oct 18 23:40:28 2011 (Pacific Daylight Time)"

If Emacs 20 can pick up the name Pacific Daylight Time correctly, from wherever
it gets it, then so should Emacs 24 be able to do so.  No user config (e.g.
setting env vars) should be necessary.  (That doesn't preclude user config - the
point is that even without it %Z should DTRT.)

In GNU Emacs 24.0.90.1 (i386-mingw-nt5.1.2600)
 of 2011-10-18 on MARVIN
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (4.6) --no-opt --cflags -I"C:/Program
Files (x86)/GnuWin32/include" -ID:/devel/emacs/libXpm-3.5.8/include
-ID:/devel/emacs/libXpm-3.5.8/src -ID:/devel/emacs/gnutls-2.10.5-x86/include
--ldflags -LD:/devel/emacs/gnutls-2.10.5-x86/lib'
 
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: ENU
  value of $XMODIFIERS: nil
  locale-coding-system: cp1252
  default enable-multibyte-characters: t