Update for recent Apache/mod_dav changes.
Update for recent Apache/mod_dav changes.

(dav_svn_get_resource): return type is a dav_error* and the resource is an
  OUT parameter
(dav_svn_get_parent_resource): same

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