tests/pkg_fatfs: Create required bin/ directory
tests/pkg_fatfs: Create required bin/ directory

miri64/RIOT,miri64/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,authmillenon/RIOT,ant9000/RIOT,miri64/RIOT,kaspar030/RIOT,ant9000/RIOT,authmillenon/RIOT,kYc0o/RIOT,kaspar030/RIOT,authmillenon/RIOT,kYc0o/RIOT,miri64/RIOT,RIOT-OS/RIOT,kaspar030/RIOT,ant9000/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,kYc0o/RIOT,ant9000/RIOT,OlegHahm/RIOT,miri64/RIOT,jasonatran/RIOT,kYc0o/RIOT,ant9000/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,OlegHahm/RIOT,kYc0o/RIOT,jasonatran/RIOT,kaspar030/RIOT,kaspar030/RIOT,jasonatran/RIOT,OlegHahm/RIOT,jasonatran/RIOT,OlegHahm/RIOT,authmillenon/RIOT,authmillenon/RIOT