Update devel/libdbusmnenu-qt and devel/libdbusmenu-qt5 to a newer snapshot.
- Update them both to 0.9.3.160420160218
- While doing so, make devel/libdbusmenu-qt5 a slaveport
Reviewed by: rakuco, mat
Approved by: rakuco (mentor)
Differential Revision: https://reviews.freebsd.org/D7895