Diff consistency fix: Report the properties on deleted files, like how
we report the deleted file content. Without this we don't create clean
'svn patch' files.

This doesn't fix the same problem for directories as the diff output still
uses the old diff callbacks api which doesn't carry the necessary information.

* subversion/libsvn_client/diff.c
  (diff_file_deleted): Calculate property changes.

* subversion/tests/cmdline/diff_tests.py
  (diff_repo_repo_added_file_mime_type): Make test actually verify output.
    Resolve comment about missing information.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1569320 13f79535-47bb-0310-9956-ffa450edef68