Add missing EVAL-WHEN around SELECT-SOCKET-CLASS.
Add missing EVAL-WHEN around SELECT-SOCKET-CLASS.

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