mod_deflate: Don't return gzip-ed data when reading FLUSH bucket in INFLATE

             input filter, forward the FLUSH but keep reading should EOS/more
             follow (should not happen, but mod_deflate won't fix it).


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1587639 13f79535-47bb-0310-9956-ffa450edef68