Fix dependencies

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

@@ -1,11 +0,0 @@
-// 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 aix darwin dragonfly freebsd linux netbsd openbsd solaris zos
-
-package socket
-
-func (h *cmsghdr) len() int { return int(h.Len) }
-func (h *cmsghdr) lvl() int { return int(h.Level) }
-func (h *cmsghdr) typ() int { return int(h.Type) }