vendor: Mega update all dependencies

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4080

vendor/golang.org/x/net/internal/netreflect/socket.go

@@ -2,8 +2,12 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build !go1.9
+
 // Package netreflect implements run-time reflection for the
 // facilities of net package.
+//
+// This package works only for Go 1.8 or below.
 package netreflect
 
 import (

vendor/golang.org/x/net/internal/netreflect/socket_19.go

@@ -0,0 +1,37 @@
+// Copyright 2017 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.
+
+// +build go1.9
+
+package netreflect
+
+import (
+	"errors"
+	"net"
+)
+
+var (
+	errInvalidType = errors.New("invalid type")
+	errOpNoSupport = errors.New("operation not supported")
+)
+
+// SocketOf returns the socket descriptor of c.
+func SocketOf(c net.Conn) (uintptr, error) {
+	switch c.(type) {
+	case *net.TCPConn, *net.UDPConn, *net.IPConn, *net.UnixConn:
+		return 0, errOpNoSupport
+	default:
+		return 0, errInvalidType
+	}
+}
+
+// PacketSocketOf returns the socket descriptor of c.
+func PacketSocketOf(c net.PacketConn) (uintptr, error) {
+	switch c.(type) {
+	case *net.UDPConn, *net.IPConn, *net.UnixConn:
+		return 0, errOpNoSupport
+	default:
+		return 0, errInvalidType
+	}
+}

vendor/golang.org/x/net/internal/netreflect/socket_posix.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build !go1.9
 // +build darwin dragonfly freebsd linux netbsd openbsd solaris windows
 
 package netreflect

vendor/golang.org/x/net/internal/netreflect/socket_stub.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build !go1.9
 // +build !darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!windows
 
 package netreflect