Function secp256k1_sys::recovery::secp256k1_ecdsa_recoverable_signature_serialize_compact

pub unsafe extern "C" fn secp256k1_ecdsa_recoverable_signature_serialize_compact(
    cx: *const Context, 
    output64: *mut c_uchar, 
    recid: *mut c_int, 
    sig: *const RecoverableSignature
) -> c_int