Fix Rust Build Warnings
// Licensed under the MIT License.
use libc::c_void;
+#[allow(unused_imports)]
use c_types::AF_UNSPEC;
+#[allow(unused_imports)]
use c_types::AF_INET;
+#[allow(unused_imports)]
use c_types::AF_INET6;
use serde::{Deserialize, Serialize};
use std::convert::TryInto;
