Simply extract part of the code from evtloopunix.cpp into a reusable
wxPipe::MakeNonBlocking() function to be able to reuse it elsewhere.
See #12636.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65992 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775