Bug#925634: suggestion of some (blunt) fixes

[Christian Ehrhardt]

Hi,
to get the mysql8 transition in Ubuntu unblocked I also wrote some
fixes for the issues that came up with GCC-9. They are rather blunt
not really going in depth into apophenia but trying to adapt new
behavior.

Never the less I thought it might be worth to share [1] as even if
there might be better changes it might give you a head start on this.

P.S. We have checked and the fix for mysql8 works with mysql5.7 and
maridb as well - no conditional check needed.

[1]: https://git.launchpad.net/~mysql-ubuntu/+git/mysql-8.0-transition/tree/apophenia-ftbfs.debdiff

-- 
Christian Ehrhardt
Software Engineer, Ubuntu Server
Canonical Ltd