Bug #104 INSERT DELAYED does not care about SQL_LOG_BIN=0

Description:
Doing SQL_LOG_BIN=0 does not prevent an INSERT DELAYED of going into the binlog.

How to repeat:
USE test;
RESET MASTER;
SET SQL_LOG_BIN=0; #this should disable binlogging
INSERT DELAYED INTO t VALUES(1);
SELECT * FROM t;
SHOW BINLOG EVENTS;
#and you can see the INSERT in the binlog

Suggested fix:
This is an understandable bug as the thread which writes the INSERT to the binlog is not the thread which issued INSERT DELAYED it and which had SQL_LOG_BIN=0.
Probably any INSERT DELAYED should be queued together with a boolean 'should_be_logged', this way the delayed_insert thread would know.

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