Update dependencies

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

@@ -2,22 +2,12 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build nacl plan9
+// +build !darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!windows
 
 package ipv4
 
-func setControlMessage(s uintptr, opt *rawOpt, cf ControlFlags, on bool) error {
+import "golang.org/x/net/internal/socket"
+
+func setControlMessage(c *socket.Conn, opt *rawOpt, cf ControlFlags, on bool) error {
 	return errOpNoSupport
 }
-
-func newControlMessage(opt *rawOpt) []byte {
-	return nil
-}
-
-func parseControlMessage(b []byte) (*ControlMessage, error) {
-	return nil, errOpNoSupport
-}
-
-func marshalControlMessage(cm *ControlMessage) []byte {
-	return nil
-}