- rpm/symsets.pl: Replace the bash and awk scripts around symsets
      and kabi checking with a single script that generates symsets,
      reuses symsets from older kernels and checks for kabi changes for
      each of the split packages (kabi checking and symset reuse
      require a set of reference files, which does not exist yet)
    - rpm/list-exported-symbols: Delete.
    - rpm/split-into-symsets: Delete.
    - scripts/kabi-checks: Delete.
    - kabi/severities: table of kabi change severities
    - rpm/built-in-where, rpm/find-provides,
      rpm/kernel-binary.spec.in, rpm/kernel-source.spec.in,
      scripts/tar-up.sh: update to use symsets.pl