CPack External: Introduce `CPACK_EXTERNAL_BUILT_PACKAGES`
The CPACK_EXTERNAL_PACKAGE_SCRIPT
script may set this list variable to the full paths of generated package files. CPack copy these files from the stage directory back to the top build directory and possibly produce checksum files if the CPACK_PACKAGE_CHECKSUM
is set.
Topic-rename: cpack-extern-update-package-list
Edited by Alex Turbov