LUCENE-4442: No longer need to copy changes or KEYS, since they are both now handled by 'ant prepare-release' (merged lucene_solr_4_1 r1434487)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1434490 13f79535-47bb-0310-9956-ffa450edef68