Comment 13 for bug 1524526

FYI about Debian on that situation.
- They are on 2.2.24 (so a merge is outstanding), but that is not affecting this situation.
- Debian has the libstemmer-dev build dependency since 2.2.12-2 (Mar 2014)
- Our merges usually have (as the last by Doko) "Drop build dependency on libstemmer-dev (universe)."

So either now or on the next merge we should/could instead of just:
  "Drop build dependency on libstemmer-dev (universe)."
Do
  - Disable plugin dovecot-lucene as it is deprecated in favor of solr.
  - Drop build dependency on libstemmer-dev (universe) only needed for dovecot-lucene.