These were added and used by commit 52991413 (CPackDeb: Enable the DEB generator on Windows, 2017-06-17, v3.10.0-rc1~445^2) but have not been used since commit df556e65 (cmCPackDebGenerator: Use libarchive to create .deb file, 2017-08-24, v3.10.0-rc1~220^2).