Changes from web page:
2003-08-10 2.4.5
* extconf.rb: correspond to MySQL 4.1.
* mysql.c.in: correspond to Ruby 1.8.
2003-02-23 2.4.4a
* make extconf.rb to correspond to Ruby 1.8.0
2003-01-29 2.4.4
* add Mysql::OPT_LOCAL_INFILE.
* add --with-mysql-config option to extconf.rb.
* extconf.rb automatically detect typical library.
2003-01-05 2.4.3c
* modified English README. Thanks to Paul DuBois.
2002-12-24 2.4.3b
* make extconf.rb to correspond to Ruby 1.6.8.
2002-11-07 2.4.3a
* fix bug duplicating constant.
2002-09-10 2.4.3
* for error number with prefix ER_ .
* get error constant from errmsg.h and mysqld_error.h automatically.
2002-03-31 2.4.2a
* change extconf.rb.