mod_reqtimeout: don't extend the timeout in speculative mode, wait for the

real (relevant) bytes to be asked later, within the currently alloted time.
This applies to blocking reads only since r1621453 already bypassed the
filter for nonblocking ones.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1641376 13f79535-47bb-0310-9956-ffa450edef68