Add a XFailing test for running 'svn patch' with property diffs against  dirs.
Add a XFailing test for running 'svn patch' with property diffs against 
dirs.

* subversion/tests/cmdline/patch_tests.py
  (patch_dir_properties): New. Note that the output for illegal targets
    (i.e. setting svn:executable on a dir) is still subject to change.
  (tests_list): Add the new test marked as XFail.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion