On remove-log-addressing branch: Further cleanup now unused code.

* subversion/libsvn_fs_fs/transaction.c
  (allocate_item_index, fnv1a_stream_baton_t, fnv1a_write_handler,
   fnv1a_wrap_stream, fnv1a_checksum_finalize): Remove.
  (rep_write_get_baton, rep_write_contents_close, write_container_rep,
   write_container_delta_rep, write_final_rev, 
   write_final_changed_path_info): Inline allocate_item_index() and remove 
   FNV1a checksum calculation.


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/remove-log-addressing@1604109 13f79535-47bb-0310-9956-ffa450edef68