* modules/filters/mod_ext_filter.c (ef_unified_filter): Set hit_eos

  flag on hitting EOS.  
  (ef_input_filter): Give back EOS if filter is invoked after hitting
  EOS, rather than attempting (and failing) to read from the closed
  pipe to the child.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1357685 13f79535-47bb-0310-9956-ffa450edef68