I've just whipped up https://wiki.mageia.org/en/Packages_carrying_bundled_copies_of_system_libraries
It's purpose is listing and maybe documenting the reasons why some packages carry bundled copies of system libraries. I've begun with ffmpeg, as it has a rather bad record for security updates on Mageia 1 IMHO, as some security updates would almost have been missed, some were delayed for a long time, and some wouldn't have been noticed unless by accident. Please, every packager participate, and list the packages you know about. Another good example would be xulrunner. PS: Maybe it should also be used to documented the packages which require some static linking, and the reasons, if there are any of these.