Update of glibc patch from MySQL 4.0

into sinisa.nasamreza.org:/mnt/mail/work/mysql

This time I did it "by the book" as this function can return any 
of the down cited values after timeout !! This is now done 100 %
according to HP-UX DCE documentation.

This made Hewlett-Packard very happy.

Changed some status variable names
Fix bug in GRANT ... PASSWORD string

mysql_copyright to replace it

Made detection of GNU tar a bit more flexible.
Only use /usr/local/mysql-glibc if it actually exists

  Play safe and set a MySQL 1 - 12 byte BLOB reference to zero except for the length and pointer areas in it

  Monty said an SQL NULL BLOB field must have NULL as the data pointer value

  Add some diagnostic code to track BLOB bugs if they were not already fixed with the change in row0sel.c
row0sel.c:
  Fix a seg fault which was caused inside MySQL because InnoDB when returning a BLOB value did not initialize the length and the data pointer of a BLOB whose value is the SQL NULL; also fix a very improbable race condition which could occur if a row with an externally stored BLOB was fetched using the adaptive hash index

into balfor.local:/home/zak/bk/mysql

(Thanks to Georg Richter!)

Hack to get MIT-pthreads to compile with glibc 2.2

see dev-private email from sasha, subject:
URGENT: rpl_sporadic_master

  Fix an assertion failure in row0ins.c line 511 in case of a cascading delete caused by circularly referencing rows, when foreign keys are used

Added copyright messages to some files that was missing it.