Merge r1634615 from trunk:

  *) On z/OS, apr_sockaddr_info_get() with family == APR_UNSPEC was not 
     returning IPv4 addresses if any IPv6 addresses were returned. 
     [Eric Covener]





git-svn-id: https://svn.apache.org/repos/asf/apr/apr/branches/1.5.x@1634619 13f79535-47bb-0310-9956-ffa450edef68