In the repos-wc diff editor: cleanup the declaration and usage of a few
edit baton variables. Remove the empty file handling as that is already
handled by the callback wrapper layer.

* subversion/libsvn_wc/diff_editor.c
  (edit_baton_t): Remove empty_file and git variables. Move processor to
    the start.
  (get_empty_file): Remove function.
  (get_prop_mimetype): Remove function.
  (file_diff,
   walk_local_nodes_diff,
   report_wc_file_as_added,
   report_wc_directory_as_added,
   delete_entry,
   close_directory,
   close_file): Update user.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1444767 13f79535-47bb-0310-9956-ffa450edef68