Function glpk_sys::_glp_lpx_dual_ratio_test

pub unsafe extern "C" fn _glp_lpx_dual_ratio_test(
    lp: *mut glp_prob, 
    len: c_int, 
    ind: *const c_int, 
    val: *const c_double, 
    how: c_int, 
    tol: c_double
) -> c_int