Remove unused cook commands

cook.sh

recipes/atk/recipe.sh

recipes/autoconf/recipe.sh

recipes/automake/recipe.sh

recipes/cairo/recipe.sh

recipes/cairodemo/recipe.sh

recipes/cmatrix/recipe.sh

recipes/diffutils/recipe.sh

recipes/dosbox/recipe.sh

recipes/duktape/recipe.sh

recipes/eduke32/recipe.sh

recipes/ffmpeg/recipe.sh

recipes/fontconfig/recipe.sh

recipes/freeciv/recipe.sh

recipes/freedoom/recipe.sh

recipes/freeglut/recipe.sh

recipes/fribidi/recipe.sh

recipes/gawk/recipe.sh

recipes/gcc/recipe.sh

recipes/gdk-pixbuf/recipe.sh