Emacs 23.0.60 and mule-gbk

看来mule-gbk在Emacs 23.0.60是用不着了。注释掉就可以完成迁移：
;; (require 'mule-gbk)
(set-language-environment "Chinese-GBK")
(set-terminal-coding-system 'chinese-gbk)
(set-keyboard-coding-system 'chinese-gbk)
(setq locale-coding-system 'chinese-gbk)
(setq current-language-environment "Chinese-GBK")
还有chinese-gb18030可用。不过gbk对我就足够用了。