Add Baloo recipe

Summary:
This fails to build for me with the Qt 5.8 you get from master meta-qt5,
due to issues with the qdbuscpp2xml generator. Using v5.9.1 from TQC's
meta-qt5 works fine though.

Reviewers: cordlandwehr

Reviewed By: cordlandwehr

Differential Revision: https://phabricator.kde.org/D7220