Change the "live" properties only if they have really changed.
Without this change 1.3.0 believes that all files have property
changes and so sends all properties to the repository.

* subversion/libsvn_client/commit_util.c
  (harvest_committables): Change the "live" properties only 
      if they have really changed.


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/meta-data-versioning@858153 13f79535-47bb-0310-9956-ffa450edef68