* subversion/libsvn_fs_fs/cached_data.c
  (svn_fs_fs__get_file_delta_stream): Use the plain delta windows only
                                      if we don't want and can provide
                                      simple plaintext.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1580406 13f79535-47bb-0310-9956-ffa450edef68