JavaHL: Update the called revprop change API.
JavaHL: Update the called revprop change API.

* subversion/bindings/javahl/native/SVNRepos.cpp
  (setRevProp): Use the atomic version of the API, but don't provide a
    known-good value.

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