Update call to deprecated API svn_diff_file_output_unified() in test case.
Update call to deprecated API svn_diff_file_output_unified() in test
case.

* subversion/tests/libsvn_diff/diff-diff3-test.c
  Include svn_utf.h.
  (two_way_diff): Replace call to svn_diff_file_output_unified() with
   svn_diff_file_output_unified2().

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion