Function basiclu_update 

pub unsafe extern "C" fn basiclu_update(
    istore: *mut lu_int,
    xstore: *mut f64,
    Li: *mut lu_int,
    Lx: *mut f64,
    Ui: *mut lu_int,
    Ux: *mut f64,
    Wi: *mut lu_int,
    Wx: *mut f64,
    xtbl: f64,
) -> lu_int