cmd/link/internal/ld: drop duplicate copyright comment

The copyright message already appears at the top of macho.go. Drop the
duplicate further down in the file.

Change-Id: Ib0a69f568c4ef656bab14176223936cd2fe078d1
Reviewed-on: https://go-review.googlesource.com/115235
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/cmd/link/internal/ld/macho.go

@@ -142,10 +142,6 @@ const (
 	S_ATTR_SOME_INSTRUCTIONS   = 0x00000400
 )
 
-// Copyright 2009 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.
-
 // Mach-O file writing
 // http://developer.apple.com/mac/library/DOCUMENTATION/DeveloperTools/Conceptual/MachORuntime/Reference/reference.html