cmake: do not explicitly specify LINK_INTERFACE_LIBRARIES

Summary:
cmake finds out about dependencies. Don't second guess it, there's no
reason to do so. The LINK_INTERFACE_LIBRARIES property is deprecated.

If anyone can explain why this is there, then it should stay, but if nobody knows,
then I'd strongly suspect it's just there for no good reason.

Reviewers: Krita

Differential Revision: https://phabricator.kde.org/D3199