Allow to build baloo-widgets with Qt 5 or 6
Allow to build for Qt5 or Qt6 depending if BUILD_WITH_QT6 is set.
i.e cmake -DBUILD_WITH_QT6=ON ..
This is transparently set when using a kdesrc config targetting qt6.
Allow to build for Qt5 or Qt6 depending if BUILD_WITH_QT6 is set.
i.e cmake -DBUILD_WITH_QT6=ON ..
This is transparently set when using a kdesrc config targetting qt6.