Fix dependencies

vendor/golang.org/x/net/ipv4/payload.go

@@ -1,23 +0,0 @@
-// Copyright 2012 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 ipv4
-
-import (
-	"net"
-
-	"golang.org/x/net/internal/socket"
-)
-
-// BUG(mikio): On Windows, the ControlMessage for ReadFrom and WriteTo
-// methods of PacketConn is not implemented.
-
-// A payloadHandler represents the IPv4 datagram payload handler.
-type payloadHandler struct {
-	net.PacketConn
-	*socket.Conn
-	rawOpt
-}
-
-func (c *payloadHandler) ok() bool { return c != nil && c.PacketConn != nil && c.Conn != nil }