We have lots of inconsistency at the moment in CMakeLists.txt files. Most of it is due to kwin being a very old project. This change hopefully fixes all of it.
Summary: Just little tidying. Reviewers: #kwin, davidedmundson Reviewed By: #kwin, davidedmundson Subscribers: kwin Tags: #kwin Differential Revision: https://phabricator.kde.org/D15725