create_cropped! (Imlib2::Image)

    /*
     * Crop an image
     *
     * Examples:
     *   x, y, w, h = 10, 10, image.width - 10, image.height - 10
     *   image.crop! x, y, w, h
     *
     *   rect = [10, 10, image.width - 10, image.height - 10]
     *   image.crop! rect
     *
     *   x, y, w, h = 10, 10, image.width - 10, image.height - 10
     *   image.create_cropped! x, y, w, h
     *
     *   rect = [10, 10, image.width - 10, image.height - 10]
     *   image.create_cropped! rect
     *
     */
    static VALUE image_crop_inline(int argc, VALUE *argv, VALUE self) {