Alterações na distribuição 3.21.31

Fixed a sign extension problem for the TINYINT type on Irix.

• Fixed problem with LEFT('constant_string',function).
• Fixed problem with FIND_IN_SET().
• LEFT JOIN core dumped if the second table is used with a constant WHERE/ON expression that uniquely identifies one record.
• Fixed problems with DATE_FORMAT() and incorrect dates. DATE_FORMAT() now ignores '%' to make it possible to extend it more easily in the future.

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