Revert the following, since it introduces a new API:

  Merge r1561040 from trunk:

  Using UDS, we sometime try ops not supported on UDS. Make this
  a known (and therfore handable) issue


git-svn-id: https://svn.apache.org/repos/asf/apr/apr/branches/1.5.x@1587750 13f79535-47bb-0310-9956-ffa450edef68