In svn_wc_conflict_description2_t, provide a copy of the property reject file
path in new prop_reject_abspath field.

* subversion/include/svn_wc.h
  (svn_wc_conflict_description2_t): Add prop_reject_abspath. This path was
   accidentally stored in their_abspath, which is wrong but cannot be
   changed without rev'ing the struct.

* subversion/libsvn_wc/conflicts.c
  (generate_propconflict, read_prop_conflict_descs): Set prop_reject_abspath
   in addition to their_abspath. Both fields point to the same value.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1619096 13f79535-47bb-0310-9956-ffa450edef68