Allow us to extend a struct in future versions.
Allow us to extend a struct in future versions.

* subversion/include/svn_client.h (svn_info_t): Note that this struct might
  grow in the future.

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