add vendor data

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

@@ -0,0 +1,42 @@
+// 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.
+
+//go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris && !windows && !zos
+
+package ipv4
+
+import (
+	"net"
+
+	"golang.org/x/net/bpf"
+	"golang.org/x/net/internal/socket"
+)
+
+func (so *sockOpt) getMulticastInterface(c *socket.Conn) (*net.Interface, error) {
+	return nil, errNotImplemented
+}
+
+func (so *sockOpt) setMulticastInterface(c *socket.Conn, ifi *net.Interface) error {
+	return errNotImplemented
+}
+
+func (so *sockOpt) getICMPFilter(c *socket.Conn) (*ICMPFilter, error) {
+	return nil, errNotImplemented
+}
+
+func (so *sockOpt) setICMPFilter(c *socket.Conn, f *ICMPFilter) error {
+	return errNotImplemented
+}
+
+func (so *sockOpt) setGroup(c *socket.Conn, ifi *net.Interface, grp net.IP) error {
+	return errNotImplemented
+}
+
+func (so *sockOpt) setSourceGroup(c *socket.Conn, ifi *net.Interface, grp, src net.IP) error {
+	return errNotImplemented
+}
+
+func (so *sockOpt) setBPF(c *socket.Conn, f []bpf.RawInstruction) error {
+	return errNotImplemented
+}