Fix Gray streams on CLISP.
Fix Gray streams on CLISP.

Thanks to Pascal Bourguignon.

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