[RFC][PATCH 01/22] JavaHL Ra API Implementation

[[[
    JavaHL: Fix return value from the java svn_stream_t read function to be
compatible with the txdelta_next_window function

    [ in subversion/bindings/javahl/native ]

    * InputStream.cpp
      (read): Return 0 instead of -1 as expected by the txdelta_next_window
function
]]]