On the fsx branch:  Remove sub-stream support for byte streams in the
svn_packed__* API.  Keep the serialized format as is for the moment.

* subversion/include/private/svn_packed_data.h
  (svn_packed__create_bytes_substream,
   svn_packed__first_byte_substream): drop

* subversion/libsvn_subr/packed_data.c
  (packed_data_create_bytes_substream_body,
   svn_packed__create_bytes_substream,
   svn_packed__first_byte_substream): drop
  (svn_packed__int_count): update caller

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/fsx@1509042 13f79535-47bb-0310-9956-ffa450edef68