Followup to r1644595, need a total order to make the sort stable.

* subversion/libsvn_client/patch.c
  (sort_matched_hunks): Sort unmatched items.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1644599 13f79535-47bb-0310-9956-ffa450edef68