Alterações na distribuição 3.20.16

More changes in MIT-pthreads to get them safer. Fixed also some link bugs at least in SunOS.

• Changed mysqld to work around a bug in MIT-pthreads. This makes multiple small SELECT operations 20 times faster. Now lock_test.pl should work.
• Added mysql_FetchHash(handle) to mysqlperl.
• The mysqlbug script is now distributed built to allow for reporting bugs that appear during the build with it.
• Changed libmysql.c to prefer getpwuid() instead of cuserid().
• Fixed bug in SELECT optimiser when using many tables with the same column used as key to different tables.
• Added new latin2 and Russian KOI8 character tables.
• Added support for a dummy GRANT command to satisfy Powerbuilder.

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