CMake creates invalid 7zip files

This is similar to #20238 (closed) which deals with zip files.

This time on KDE with Ark I cannot extract 7zip files created by CMake. In this case a Linux build of Qt Creator

Unpacking via cmake -E tar xf QtCreator-Linux-33393227.7z works fine.

I assume the fix would be to have the same treatment for 7zip files as for zip files.