Intellij config: JDK setup: in target '-post-idea-intructions', for branch_4x, give 1.6 instead of 1.7 as the JDK version in the example build.properties line

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1524919 13f79535-47bb-0310-9956-ffa450edef68