Fix propagation of mergeinfo for copied paths.
Fix propagation of mergeinfo for copied paths.

* subversion/libsvn_client/copy.c
  (calculate_target_mergeinfo): Calculate correct mergeinfo for copied
   paths.  Defer calculation of repository-relative path for the copy
   source until actually necessary.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@866568 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion