Fix dependencies

vendor/golang.org/x/net/ipv6/header.go

@@ -1,55 +0,0 @@
-// Copyright 2014 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 ipv6
-
-import (
-	"encoding/binary"
-	"fmt"
-	"net"
-)
-
-const (
-	Version   = 6  // protocol version
-	HeaderLen = 40 // header length
-)
-
-// A Header represents an IPv6 base header.
-type Header struct {
-	Version      int    // protocol version
-	TrafficClass int    // traffic class
-	FlowLabel    int    // flow label
-	PayloadLen   int    // payload length
-	NextHeader   int    // next header
-	HopLimit     int    // hop limit
-	Src          net.IP // source address
-	Dst          net.IP // destination address
-}
-
-func (h *Header) String() string {
-	if h == nil {
-		return "<nil>"
-	}
-	return fmt.Sprintf("ver=%d tclass=%#x flowlbl=%#x payloadlen=%d nxthdr=%d hoplim=%d src=%v dst=%v", h.Version, h.TrafficClass, h.FlowLabel, h.PayloadLen, h.NextHeader, h.HopLimit, h.Src, h.Dst)
-}
-
-// ParseHeader parses b as an IPv6 base header.
-func ParseHeader(b []byte) (*Header, error) {
-	if len(b) < HeaderLen {
-		return nil, errHeaderTooShort
-	}
-	h := &Header{
-		Version:      int(b[0]) >> 4,
-		TrafficClass: int(b[0]&0x0f)<<4 | int(b[1])>>4,
-		FlowLabel:    int(b[1]&0x0f)<<16 | int(b[2])<<8 | int(b[3]),
-		PayloadLen:   int(binary.BigEndian.Uint16(b[4:6])),
-		NextHeader:   int(b[6]),
-		HopLimit:     int(b[7]),
-	}
-	h.Src = make(net.IP, net.IPv6len)
-	copy(h.Src, b[8:24])
-	h.Dst = make(net.IP, net.IPv6len)
-	copy(h.Dst, b[24:40])
-	return h, nil
-}