another iteration on the saferead/bhalfduplex stuff ... there was a

commented out bhalfduplex call which ryan missed; and which was a bit
more troublesome to solve with the iol interface.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85494 13f79535-47bb-0310-9956-ffa450edef68