Function update_KKT_P 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn update_KKT_P(
    KKT: *mut csc,
    P: *const csc,
    PtoKKT: *const c_int,
    param1: c_float,
    Pdiag_idx: *const c_int,
    Pdiag_n: c_int,
)