Simplify some parameter passing in merge code.
Simplify some parameter passing in merge code.

* subversion/libsvn_client/merge.c
  (find_unmerged_mergeinfo): Take a 'target' struct instead of separate
    'target_rev' and 'target_repos_rel_path' parameters.
  (calculate_left_hand_side): Take a 'target' struct instead of separate
    'target_rev' and 'target_repos_rel_path' and 'target_abspath' parameters.
  (find_reintegrate_merge): Adjust caller.

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