Log Message:
Update to version 2.9004.

The list of changes is long, and can be found inside the archive in the
ChangeLog file or online at the following URL:

http://search.cpan.org/src/RUDY/DBD-mysql-2.9004/ChangeLog

I'm committing this during the freeze because it's an update that I forgot
when committing the rt3 package, and rt3 needs it.