Follow up to r1543033:

Use the new code required for OS X/Darwin on the other platforms too.
(IOW, we're willing to peek in the socket as long as APR_POLLIN is
returned, regardless of other flags.)


git-svn-id: https://svn.apache.org/repos/asf/apr/apr/trunk@1543056 13f79535-47bb-0310-9956-ffa450edef68