Same as Jeff Trawick's patch [thank you!] only a tad faster, and error
  out on the old Set{Input|Output}Filter onefilter twofilter syntax
  (prior to this patch, only the last filter in a space seperated list
  would be configured.)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@90813 13f79535-47bb-0310-9956-ffa450edef68