LUCENE-5243: Temporarily fix problem with Clover + Java 7 caused by broken comparator. Once Clover 3.2.0 is out we can remove the snapshot repository. This patch is needed on trunk only (because Java 7)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1526210 13f79535-47bb-0310-9956-ffa450edef68