Changes in release 3.21.33
--------------------------
* Fixed problem when sending `SIGHUP' to `mysqld'; `mysqld' core
dumped when starting from boot on some systems.
* Fixed problem with losing a little memory for some connections.
* `DELETE FROM tbl_name' without a `WHERE' condition is now done the
long way when you use `LOCK TABLES' or if the table is in use, to
avoid race conditions.
* `INSERT INTO TABLE (timestamp_column) VALUES (NULL);' didn't set
timestamp.