OPENDJ-1579 Build failure on Windows 7 as dependent packages are not copied to lib folder
Using regexpmapper's handledirsep attribute for Windows builds. See https://ant.apache.org/manual/Types/mapper.html

git-svn-id: https://svn.forgerock.org/opendj/trunk/opends@11276 41b1ffd8-f28e-4786-ab96-9950f0a78031