Update set of files to download for cygwin to include
        diffutils and regenerate the zip file.  This should fix
        an issue on vista where svn-create-patch doesn't work.

        * CygwinDownloader/cygwin-downloader.py:
        * CygwinDownloader/cygwin-downloader.zip:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@23537 268f45cc-cd09-0410-ab3c-d52691b4dbfc