LUCENE-5858: add missing references to backward-codecs
LUCENE-5858: add missing references to backward-codecs

git-svn-id: a5b395fa43d2b05f44ca74753be84bd8ec84c948@1621849 13f79535-47bb-0310-9956-ffa450edef68

cscorley/solr-only-mirror,cscorley/solr-only-mirror,cscorley/solr-only-mirror