Optimize reading keep-alive requests with APR_INCOMPLETE_READ. In the

profiling I've done, the read() in apr_read() would always fail with
EAGAIN. This will send the thread directly to select to wait for the
next request.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@95968 13f79535-47bb-0310-9956-ffa450edef68