Added explicit DEFGENERIC form for FLIP-SCREEN-CURSOR.
Added explicit DEFGENERIC form for FLIP-SCREEN-CURSOR.

swflint/McCLIM,swflint/McCLIM,onixie/mcclim,slyrus/mcclim,onixie/mcclim,onixie/mcclim,swflint/McCLIM,slyrus/mcclim