emacs-unicode-2: `locale-preferred-coding-systems' improvements on chinese locales

[Zhang Wei]

The `locale-preferred-coding-systems' variable should also 
be improved for chinese locales.


*** lisp/international/mule-cmds.el.~1.242.2.25.~       2005-09-26 
06:07:01.000000000 +0800
--- lisp/international/mule-cmds.el     2005-10-27 13:58:14.000000000 +0800
***************
*** 2280,2293 ****
       ("koi8-?r" . koi8-r)
       ("koi8-?u" . koi8-u)
       ("tcvn" . tcvn)
       ("big5" . big5)
       ("euc-?tw" . euc-tw)
!      ;; We don't support GBK, but as it is upper compatible with
!      ;; GB-2312, we setup the default coding system to gb2312.
!      ("gbk" . gb2312)
!      ;; We don't support BIG5-HKSCS, but as it is upper compatible with
!      ;; BIG5, we setup the default coding system to big5.
!      ("big5hkscs" . big5)
       ("ja.*[._]euc" . japanese-iso-8bit)
       ("ja.*[._]jis7" . iso-2022-jp)
       ("ja.*[._]pck" . japanese-shift-jis)
--- 2280,2292 ----
       ("koi8-?r" . koi8-r)
       ("koi8-?u" . koi8-u)
       ("tcvn" . tcvn)
+      ("big5[-_]?hkscs" . big5-hkscs)
       ("big5" . big5)
       ("euc-?tw" . euc-tw)
!      ("euc-?cn" .euc-cn)
!      ("gb2312" . gb2312)
!      ("gbk" . gbk)
!      ("gb18030" . gb18030)
       ("ja.*[._]euc" . japanese-iso-8bit)
       ("ja.*[._]jis7" . iso-2022-jp)
       ("ja.*[._]pck" . japanese-shift-jis)