Convert backslashes in Windows paths to forward slashes - otherwise StreamTokenizer interprets the backslashes as escape chars, and work.dir can't be found. (merged trunk r1439751)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1439752 13f79535-47bb-0310-9956-ffa450edef68