Instead of duplicating file names that need to be include()'ed in two different places if the files are meant to be used in both Qt builds and public user projects and then also mention the name when installing, extract the file names into lists returned by functions. Call these functions where needed to iteratively include() the files as well as install them, without having to remember updating multiple code locations. The new functions return the following list of file names: - upstream cmake modules that need to be included during a Qt build - public (Qt build and user project) cmake helpers that need to be included and installed - private (Qt build only) cmake helpers that need to be included and installed - public files that need to be installed, but not included - private files that need to be installed, but not included We also generate the list of public files to include in Qt6Config.cmake. Task-number: QTBUG-86035 Change-Id: I1e7287f4e1d041c723f144ba9626b34f873c4891 Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>