Use eln and rawhide arch symlinks from repo files
    
    Sometimes installation just selected packages from rawhide is requested.
    Prevent signature verification failure when installing rawhide package
    on older stable release. Releasever in rawhide repo would link to
    stable fedora, but package might be signed by more recent key.
    Link always to the latest rawhide key link provided by fedora-gpg-keys.