akonadi - update

In some configurations the MySQL storage backend for Akonadi, an
extensible cross-desktop Personal Information Management (PIM) storage
service failed to start after applying the MySQL 5.5.53 security upgrade.

This update extends the /etc/akonadi/mysql-global.conf configuration
file to restore compatibility (version 1.13.0-2+deb8u2).

We recommend that you upgrade your akonadi packages.