Function gsl_sys::gsl_multifit_linear_gcv_min

pub unsafe extern "C" fn gsl_multifit_linear_gcv_min(
    reg_param: *const gsl_vector, 
    UTy: *const gsl_vector, 
    G: *const gsl_vector, 
    delta0: f64, 
    lambda: *mut f64, 
    work: *mut gsl_multifit_linear_workspace
) -> c_int