Add more net compatibility

Required for net/http.

iprawsock.go

@@ -0,0 +1,13 @@
+// The following is copied from Go 1.16 official implementation.
+
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package net
+
+// IPAddr represents the address of an IP end point.
+type IPAddr struct {
+	IP   IP
+	Zone string // IPv6 scoped addressing zone
+}