Alterações na distribuição 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.

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