Functionality added or changed:
* InnoDB: Made LOCK TABLES behave by default like it did before
MySQL 4.0.20 or 4.1.2: no InnoDB lock will be taken. Added a
startup option and settable system variable innodb_table_locks for
making LOCK TABLE acquire also InnoDB locks. See section
"Restrictions on InnoDB Tables" in the manual.
(Bug #3299, Bug #5998)