Update a couple of deprecated function calls.
Update a couple of deprecated function calls.

* subversion/libsvn_client/merge.c
  (find_unmerged_mergeinfo, calculate_left_hand_side):
    Use svn_ra_get_mergeinfo2().

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion