minor cleanup to the --order-by-primary feature code

clause the the SELECT statement used to dump the data
for any table which has a primary or unique key.  This
is useful for dumping MyISAM tables which will be later
imported into InnoDB tables.

into mysql.com:/home/dlenev/src/mysql-4.1-tzfix

into mysql.com:/home/dlenev/src/mysql-4.1-tzfix

into mysql.com:/build/mysqldev/my/mysql-4.1-tomastest

into mysql.com:/users/kboortz/daily/work/mysql-4.1-sjis

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1-ndb

fixed in the main tree).

into mysql.com:/media/sda1/mysql/mysql-4.1-6050

compilation problems on some platforms'

names with ident. tables fr. diff. schemata": revise all uses of
Item_field and make them prepared-statements friendly when necessary.

into mysql.com:/home/jonas/src/mysql-4.1

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1-ndb

into mysql.com:/users/kboortz/daily/work/mysql-4.1-purify2

  Bug#6167 One element missing in 'uc_update_queries[]'

into hundin.mysql.fi:/home/jan/talle/mysql-4.1

this timestamp might not be the correct time because e.g. ALTER TABLE
changes this timestamp.

  Added SQLSTATE matching support to test engine
mysqltest.result, mysqltest.test:
  new file

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1-ndb

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1

mysql.time_zone* tables".

We are excluding implicitly used time zone tables from privilege
checking.

some platforms provide posix snprintf via special defined, these defines however cause problems elsewhere
so this is a way to only have to do this define in one file

into mysql.com:/media/sda1/mysql/mysql-4.1-6059

into mysql.com:/M41/mysql-4.1

into mysql.com:/media/sda1/mysql/mysql-4.1-6059

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1-ndb