To close issue #3362, add a regression test on running patch on a self
produced diff.

* subversion/tests/cmdline/patch_tests.py
  (imports): Add filecmp.
  (patch_apply_no_fuz): Add full issue #3362 regression test, by creating a
    diff and ensuring it applies 100% with no fuz.
  (test_list): Add test.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1437576 13f79535-47bb-0310-9956-ffa450edef68