MDEV-7108: Make long semaphore wait timeout configurable
Merge Facebook commit https://github.com/facebook/mysql-5.6/commit/cd063ab930f05efdba39d504543998512d1bd71f authored by Peng Tian from https://github.com/facebook/mysql-5.6 Introduced a new configuration variable innodb_fatal_semaphore_wait_threshold, it makes the fatal semaphore timeout configurable. Modified original commit so that no MariaDB server files are changed, instead introduced a new InnoDB/XtraDB configuration variable. Its default/min/max vlaues are 600/1/2^32-1 in seconds (it was hardcoded as 600, now its default value is 600, so the default behavior of this diff should be no change).
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