fts-sorl: Skip returned duplicate results. Similar to bugfix d63b209737be in fts-lucene.
fts-sorl: Skip returned duplicate results.
Similar to bugfix d63b209737be in fts-lucene.

This caused assert-crash at least when searching from virtual mailbox
because the score array was larger than the actual number of results.

dscho/dovecot,dscho/dovecot,dscho/dovecot,dscho/dovecot,dscho/dovecot