Adjust a C-unit test for parsing git diffs to have " b/" as part of  the paths.
Adjust a C-unit test for parsing git diffs to have " b/" as part of 
the paths.

The diff-parser searches for " b/" to find the start of old_path.

* subversion/tests/libsvn_diff/parse-diff-tests.c
  (git_diff_with_spaces_diff,
   test_git_diffs_with_spaces_diff): See above.

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