mysql write support patch updated to 3.4.5

[Per Jessen]

I have updated Stefan Jakobs' patch (see
https://marc.info/?l=postfix-users&m=128714800025241 ) to apply to
postfix 3.4.5. 

https://wiki.jessen.ch/index/Postfix_with_mysql_write_support


-- 
Per Jessen, Zürich (17.5°C)