we don't need to use select() in DoWait() if we're receiving notifications about...

we don't need to use select() in DoWait() if we're receiving notifications about changes on our socket anyhow, this makes the code less efficient and, most importantly, much more confusing than necessary

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@57566 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775