imap_search.php

1. 更改郵件搜尋編碼固定為 zh_TW，當用戶使用英文界面，也可以進行中文郵件搜尋。

   [root@mail squirrelmail-1.4.8]# diff -wuN ./functions/imap_search.php /var/www/squirrelmail/functions/imap_search.php
   --- ./functions/imap_search.php	2006-02-04 06:27:47.000000000 +0800
   +++ /var/www/squirrelmail/functions/imap_search.php	2012-05-16 09:44:32.000000000 +0800
   @@ -71,7 +71,7 @@
        if ($allow_charset_search && isset($languages[$squirrelmail_language]['CHARSET']) &&
            $languages[$squirrelmail_language]['CHARSET']) {
            $ss = "SEARCH CHARSET "
   -            . strtoupper($languages[$squirrelmail_language]['CHARSET'])
   +            . strtoupper($languages['zh_TW']['CHARSET']) //dywang
                . " ALL $search_string";
        } else {
            $ss = "SEARCH ALL $search_string";