Add license header for Duet's makefile.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10218 6f19259b-4bc3-4df7-8a09-765794883524

DuetPkg/BootSector/GNUmakefile

@@ -1,4 +1,18 @@
-# Just use host GCC to compile boot sector image.
+## @file
+#  Just use host GCC to compile boot sector image.
+#
+#  Copyright (c) 2010, Intel Corporation, All rights reserved. <BR>
+#
+#  This program and the accompanying materials
+#  are licensed and made available under the terms and conditions of the BSD License
+#  which accompanies this distribution. The full text of the license may be found at
+#  http://opensource.org/licenses/bsd-license.php
+#  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+#
+##
+
 ASM=gcc
 DLINK=ld