Update vendor/

Signed-off-by: Ben Kochie <superq@gmail.com>

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

@@ -14,9 +14,8 @@ import (
 )
 
 const (
-	Version      = 4  // protocol version
-	HeaderLen    = 20 // header length without extension headers
-	maxHeaderLen = 60 // sensible default, revisit if later RFCs define new usage of version and header length fields
+	Version   = 4  // protocol version
+	HeaderLen = 20 // header length without extension headers
 )
 
 type HeaderFlags int

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

@@ -13,16 +13,13 @@ import (
 )
 
 var (
-	errInvalidConn              = errors.New("invalid connection")
-	errMissingAddress           = errors.New("missing address")
-	errMissingHeader            = errors.New("missing header")
-	errNilHeader                = errors.New("nil header")
-	errHeaderTooShort           = errors.New("header too short")
-	errExtHeaderTooShort        = errors.New("extension header too short")
-	errInvalidConnType          = errors.New("invalid conn type")
-	errNoSuchInterface          = errors.New("no such interface")
-	errNoSuchMulticastInterface = errors.New("no such multicast interface")
-	errNotImplemented           = errors.New("not implemented on " + runtime.GOOS + "/" + runtime.GOARCH)
+	errInvalidConn       = errors.New("invalid connection")
+	errMissingAddress    = errors.New("missing address")
+	errNilHeader         = errors.New("nil header")
+	errHeaderTooShort    = errors.New("header too short")
+	errExtHeaderTooShort = errors.New("extension header too short")
+	errInvalidConnType   = errors.New("invalid conn type")
+	errNotImplemented    = errors.New("not implemented on " + runtime.GOOS + "/" + runtime.GOARCH)
 
 	// See https://www.freebsd.org/doc/en/books/porters-handbook/versions.html.
 	freebsdVersion  uint32

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

@@ -7,12 +7,15 @@
 package ipv4
 
 import (
+	"errors"
 	"net"
 	"unsafe"
 
 	"golang.org/x/net/internal/socket"
 )
 
+var errNoSuchInterface = errors.New("no such interface")
+
 func (so *sockOpt) setIPMreq(c *socket.Conn, ifi *net.Interface, grp net.IP) error {
 	mreq := ipMreq{Multiaddr: [4]byte{grp[0], grp[1], grp[2], grp[3]}}
 	if err := setIPMreqInterface(&mreq, ifi); err != nil {