Bug #3403 Wrong encoding in SHOW GRANTS, EPLAIN SELECT output

Description:
SHOW GRANTS, EXPLAIN SELECT (and probably some other informational) queries
return database/table names in wrong encoding (probably UTF-8) if database/table names
include national characters. In my case koi8r.
This is serious as my app needs to parse SHOW GRANTS output.

How to repeat:
my.cnf
...
[mysqld]
language=russian
default-character-set=koi8r
...
CREATE DATABASE `koi8r name`;
GRANT SELECT ON `koi8r name`.* TO `some valid user`@`localhost`;
FLUSH PRIVILEGES;
SHOW GRANTS FOR `same user`@`localhost`;
Database name shows up as ???????
...
CREATE TABLE `some database`.`koi8r name` (id int) TYPE=MyISAM;
INSERT INTO `some database`.`koi8r name` SET `id`='1';
EXPLAIN SELECT * FROM `some database`.`koi8r name` LIMIT 5;
Table name shows up as ????

GRANT related fix has been applied to 4.1.2 sources.
EXPLAIN will be fixed in a separate changeset.

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