the my.cnf, works as command
      
Different parsing mechanisms are used for command line/my.cnf 
options  and the SQL commands.  The former only accepted
numeric arguments, and regarded all numbers different from 0 
as 'true'.  Any other argument was parsed as 'false' .
      
This patch adds the words 'true' and 'on' as valid truth
values for boolean option arguments.
      
A test case is not provided, as the fix is simple and
does not warrant a separate test file (no existing
suitable test file was found)

(backported from mysql-trunk)