Fix USTRING-TO-STRING*.
Fix USTRING-TO-STRING*.

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