Fix problem where a 304 response was not generating an EOS bucket.

ap_finalize_request_protocol()'s sole purpose in Apache 2.0 is to
send the EOS bucket. Probably need to reimplement ap_send_error_response()
to be consistent with ap_finalize...'s new mission.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86702 13f79535-47bb-0310-9956-ffa450edef68