On the fsx branch:  Fix the issues in our svn_packed_data__* code
discovered by our new tests.

* subversion/libsvn_subr/packed_data.c
  (svn_packed__byte_stream_t,
   write_byte_stream_structure): byte streams don't have sub-streams
  (svn_packed__data_fill_buffer): fix unpacking of deltified (u/)ints
  (read_byte_stream_structure): must read the sub-stream count even if it's 0

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/fsx@1509229 13f79535-47bb-0310-9956-ffa450edef68