During move-update only merge text and notify text update if the text
is changing.

* subversion/libsvn_wc/wc_db_update_move.c
  (update_working_file): Only merge text if checksums differ.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1450826 13f79535-47bb-0310-9956-ffa450edef68