While processing filters on internal redirects, remember seen EOS

buckets also in the request structure of the redirect issuer(s). This
prevents filters (such as mod_deflate) from adding garbage to the response,
because ap_finalize_request_protocol won't send another EOS bucket then.

PR: 14451


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@98762 13f79535-47bb-0310-9956-ffa450edef68