Follow-up to r990790.
Follow-up to r990790.

Skip a diff test unless we're using ra_neon. For some reason,
ra_local and ra_svn does not call apply_textdelta() for copied
paths with no text changes while ra_neon does.

* subversion/tests/cmdline/diff_tests.py
  (test_list): Mark diff_backward_repos_wc_copy() with SkipUnless.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@990804 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion