[liblouis/f19] (6 commits) ...merged f19 with master

[Martin Gieseking]

Summary of changes:

  7af66a3... remove python3 dependency and corresponding packages when b (*)
  70633a7... restrict exclusion of Python 3 packages to RHEL < 7 (*)
  a327ba2... restrict exclusion of Python 3 support to RHEL <= 7 (*)
  64e6a98... Tighten dependencies between subpackages (*)
  6c1c3ac... updated to release 2.5.3 (*)
  1062d8d... merged f19 with master

(*) This commit already existed in another branch; no separate mail sent