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We can drop Purpose here, that's part of the runtime now.

This should fix the build on binary factory.

The remaining build issue here should be fixed with the KF 5.74 update.

Has the additional benefit of fixing the build.

Same as in Kontact, should fix the build with a newer SDK.

As I found out it's not needed here anymore.

The CardDav/CalDav resources supersede this since some time, and following
that we can also drop the xsd dependency (which doesn't build anymore with
the 5.15 SDK), as well as kdelibs4support.

This fixes the build with Qt 5.15.

try to improve build stability by using out of source builds for baloo
and elisa

switch back to cmake-ninja as it seems to work for me