Add test from #2460, import dhcpdns

vendor/github.com/lifenjoiner/dhcpdns/sockopt_reuse0.go

@@ -0,0 +1,21 @@
+// Copyright 2023-now by lifenjoiner. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+//go:build windows || (js && wasm)
+// +build windows js,wasm
+
+package dhcpdns
+
+import (
+	"net"
+)
+
+// SO_REUSEADDR and SO_REUSEPORT: https://stackoverflow.com/questions/14388706/
+
+// `SO_REUSEADDR` doesn't really work for this on Windows, if `DHCP Client` service occupies the port!
+// https://learn.microsoft.com/en-us/windows/win32/winsock/using-so-reuseaddr-and-so-exclusiveaddruse
+// On Windows, the 1st bind receives the reply data.
+func reuseListenPacket(network, address string) (net.PacketConn, error) {
+	return net.ListenPacket(network, address)
+}