for compatibilty reasons automoc4 support is not removed but it
shall be in the future. automoc4 has not been maintained for a
while (last commit is from 2011) and the stable release is from
2009.
CMake version >= 2.8.6 provides the functionality for mocking so
I see no reason to not make use of it.
I am not sure if this was inteded or not but I'm keen to say that
when it was implemented the developer missed to make it part of
the KDE UI public interface API