Alterações na distribuição 3.20.15

Fixed fatal bug packets out of order when using MIT-pthreads.

• Removed possible loop when a thread waits for command from client and fcntl() fails. Thanks to Mike Bretz for finding this bug.
• Changed alarm loop in mysqld.cc because shutdown didn't always succeed in Linux.
• Removed use of termbits from mysql.cc. This conflicted with glibc 2.0.
• Fixed some syntax errors for at least BSD and Linux.
• Fixed bug when doing a SELECT as superuser without a database.
• Fixed bug when doing SELECT with group calculation to outfile.

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