follow up to r1202257 -- perform normal wakeup processing when

APR_EINTR is seen from apr_pollset_poll(), with expectation that
it was triggered by apr_pollset_wakeup()


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1203858 13f79535-47bb-0310-9956-ffa450edef68