add simple utility to check for exports that are unused elsewhere
add simple utility to check for exports that are unused elsewhere

darcs-hash:20061122035743-1a7c6-3604ea8242d210d39adb4022ac27c6c160666f17

kirbyfan64/jhc,kirbyfan64/jhc,kirbyfan64/jhc,kirbyfan64/jhc