Fix yet another issue in the patch_change_symlink_target test, and create
another test based upon the error we had in this test.

* subversion/tests/cmdline/patch_tests.py
  (patch_change_symlink_target): Not only did the file names not match, the
    file body didn't match either. This makes the test succeed on systems
    without symlink support. Verify if the final node type matches to
    fail on more error cases without attempting to verify the link yet.

  (single_line_mismatch): New XFail test which shows that currently a non
    matching line patch deletes the target.
  (test_list): Add test.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1436002 13f79535-47bb-0310-9956-ffa450edef68