Alterações na distribuição 3.21.18

Issue error message if client C functions are called in wrong order.

• Added automatic reconnect to the libmysql.c library. If a write command fails, an automatic reconnect is done.
• Small sort sets no longer use temporary files.
• Upgraded DBI to 0.91.
• Fixed a couple of problems with LEFT OUTER JOIN.
• Added CROSS JOIN syntax. CROSS is now a reserved word.
• Recoded yacc/bison stack allocation to be even safer and to allow MariaDB to handle even bigger expressions.
• Fixed a couple of problems with the update log.
• ORDER BY was slow when used with key ranges.

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