The following programs have no `.path` files for CentOS

- `zopfli`
  - It seems this is now part of Fedora from Fedora 20 - see https://admin.fedoraproject.org/pkgdb/package/zopfli/
- `pixz` & `plzip`
  - These are fallback nice-to-have dependencies and we could drop them from the `compress` module.
- `zpaq`
  - This changes frequently, often in incompatible ways
- `fakeroot-ng`
