innodb_table_locks_old_behavior: do not acquire an
InnoDB table lock for LOCK TABLES, as in mysql-4.0.18
and earlier.


sql/ha_innodb.cc:
  Do not acquire an InnoDB table lock for LOCK TABLES if
  innodb_table_locks_old_behavior is enabled.
sql/mysqld.cc:
  Added innodb_table_locks_old_behavior
sql/set_var.cc:
  Added innodb_table_locks_old_behavior
sql/sql_class.h:
  Added innodb_table_locks_old_behavior