Compute the content length (and add appropriate header field) for

the response when no content length is available and we can't use
chunked encoding.

This is going to be painful when the response body is huge, so I
suspect we'll have additional criteria in the future.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86775 13f79535-47bb-0310-9956-ffa450edef68