When a table uses two (or more) fulltext keys with different fulltext parsers,
all fulltext keys (excluding those that use built-in parser) were using first
parser that was mentioned in .frm.

With this fix fulltext keys use proper (assigned during create table) fulltext
parser.

This code was contributed by Yoshinori Matsunobu ymatsunobu@mysql.com
on 2007-03-12 The copyright was assigned and transferred under the
terms of the MySQL Contributor License Agreement.