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  1. MariaDB Server
  2. MDEV-15584

Linux - use O_TMPFILE for create_temp_file

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      This pr, branched from #639, uses the Linux the open(2) O_TMPFILE option to create an already delete temporary.

      With this option we don't need to delete the created file and for convenience we don't use my_register_filename to allocate string copies of names (as an aside - is this really still needed in the code? Seems only there for debugging).

      As such we don't need to dup in innobase_mysql_tmpfile.

      Like the my_register_filename, we do increase statistic counters like #657.

      If the open(O_TMPFILE) fails, unsupported filesystem for instance, fall back to mk{,o}stemp

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              serg Sergei Golubchik
              svoj Sergey Vojtovich
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