Remove obsolete check for O_NONBLOCK: FDs are always non-blocking now.
Remove obsolete check for O_NONBLOCK: FDs are always non-blocking now.

sionescu/iolib,sionescu/iolib,lispnik/iolib,shamazmazum/iolib,dkochmanski/iolib,dkochmanski/iolib,deadtrickster/iolib,deadtrickster/iolib,lispnik/iolib,attila-lendvai/iolib,attila-lendvai/iolib,tiago4orion/iolib,shamazmazum/iolib,sionescu/iolib,dkochmanski/iolib,deadtrickster/iolib,shamazmazum/iolib,attila-lendvai/iolib,tiago4orion/iolib,tiago4orion/iolib,lispnik/iolib