Sprinkle some const-correctness on the unidiff application code.
Sprinkle some const-correctness on the unidiff application code.

Suggested by: gstein

* subversion/libsvn_client/patch.c
  (patch_target_t): Mark two fields const.
  (apply_textdiffs, init_patch_target, determine_hunk_line,
   merge_hunk, apply_one_hunk, maybe_send_patch_target_notification,
   apply_one_patch): Mark some parameters const.

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