Function t85_encode_set_image_width 

pub unsafe extern "C" fn t85_encode_set_image_width(
    s: *mut t85_encode_state_t,
    image_width: u32,
) -> c_int

\brief Set the image width. \param s The T.85 context. \param image_width The width of the image. \return 0 for success, otherwise -1.