On 1.8.x-issue4480 branch.

* subversion/mod_dav_svn/repos.c
  (do_out_of_date_check): Reverse test so that OOD is correctly detected,
   make variables const to avoid compiler warning.


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/1.8.x-issue4480@1589793 13f79535-47bb-0310-9956-ffa450edef68