Do not ship .linked files
libsemanage was updated [1] to use {policy,seusers,users_extra}.linked files
to cache the linked policy prior to merging local changes. We don't need
to ship these files, however the files should be owned by selinux-policy
packages on a filesystem.
[1] https://github.com/SELinuxProject/selinux/commit/8702a865e08b5660561e194a83e4a363061edc03