Include io.h instead of unistd.h on Windows in oscap-ds.c
Include io.h instead of unistd.h on Windows in oscap-ds.c

OpenSCAP/openscap,mpreisler/openscap,redhatrises/openscap,OpenSCAP/openscap,mpreisler/openscap,jan-cerny/openscap,mpreisler/openscap,jan-cerny/openscap,jan-cerny/openscap,jan-cerny/openscap,redhatrises/openscap,redhatrises/openscap,redhatrises/openscap,OpenSCAP/openscap,OpenSCAP/openscap,jan-cerny/openscap,mpreisler/openscap,redhatrises/openscap,OpenSCAP/openscap,mpreisler/openscap,redhatrises/openscap,OpenSCAP/openscap,jan-cerny/openscap,mpreisler/openscap