Add the platform test HAVE_UNC_PATHS and carefully authenticate that
  colon is -followed- by a slash for an absolute path under Win32 [Please
  check OS2 on this point  as well!]


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@86286 13f79535-47bb-0310-9956-ffa450edef68