Bug#886899: recoll: epub-filter broken, requires 'python-epub' which is not packaged

[Jean-Francois Dockes]

As an aside to this, catdoc is not needed at all by recent recoll versions
(1.19.12 and later).

Details about the external programs here:
  https://www.lesbonscomptes.com/recoll/features.html#doctypes

jf (upstream)