Add missing find_dependency calls
There are probably more used in the public link interface, but these were enough to fix building dependents with cmake 3.24.0-rc3, which seems to be stricter than 3.23.x.
There are probably more used in the public link interface, but these were enough to fix building dependents with cmake 3.24.0-rc3, which seems to be stricter than 3.23.x.