Follow up to r21277: make get_path_ancestor_length not return the protocol  as common part when passed two URLs.
Follow up to r21277: make get_path_ancestor_length not return the protocol 
as common part when passed two URLs.

Approved by: rooneg

* subversion/libsvn_subr/path.c
  (get_path_ancestor_length): Fixed incorrect comment. Add new urls
   parameter and use it to make a distinction between URLs and folders.
  (svn_path_get_longest_ancestor): pass the new urls parameter to
   get_path_ancestor_length

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