Use backlash divider on Windows.
Use backlash divider on Windows.

Some Windows shell commands know how to interpret forward slashes in paths, 
but others have trouble, notably "del".

git-svn-id: 0e6074679e66e8f1cc73dfc755b08bab367f805b@1128800 13f79535-47bb-0310-9956-ffa450edef68

apache/lucy-charmonizer,apache/lucy-charmonizer