add copyright to rtcd files

Allows them to pass the license check in chromium.

BUG=chromium:98319

Change-Id: Iefc1706152a549d8c4ae774c917596bf1c9492d8

build/make/rtcd.pl

 #!/usr/bin/env perl
+##
+##  Copyright (c) 2017 The WebM project authors. All Rights Reserved.
+##
+##  Use of this source code is governed by a BSD-style license
+##  that can be found in the LICENSE file in the root of the source
+##  tree. An additional intellectual property rights grant can be found
+##  in the file PATENTS.  All contributing project authors may
+##  be found in the AUTHORS file in the root of the source tree.
+##
 
 no strict 'refs';
 use warnings;

vp8/common/rtcd_defs.pl

+##
+##  Copyright (c) 2017 The WebM project authors. All Rights Reserved.
+##
+##  Use of this source code is governed by a BSD-style license
+##  that can be found in the LICENSE file in the root of the source
+##  tree. An additional intellectual property rights grant can be found
+##  in the file PATENTS.  All contributing project authors may
+##  be found in the AUTHORS file in the root of the source tree.
+##
+
 sub vp8_common_forward_decls() {
 print <<EOF
 /*

vp9/common/vp9_rtcd_defs.pl

+##
+##  Copyright (c) 2017 The WebM project authors. All Rights Reserved.
+##
+##  Use of this source code is governed by a BSD-style license
+##  that can be found in the LICENSE file in the root of the source
+##  tree. An additional intellectual property rights grant can be found
+##  in the file PATENTS.  All contributing project authors may
+##  be found in the AUTHORS file in the root of the source tree.
+##
+
 sub vp9_common_forward_decls() {
 print <<EOF
 /*

vpx_dsp/vpx_dsp_rtcd_defs.pl

+##
+##  Copyright (c) 2017 The WebM project authors. All Rights Reserved.
+##
+##  Use of this source code is governed by a BSD-style license
+##  that can be found in the LICENSE file in the root of the source
+##  tree. An additional intellectual property rights grant can be found
+##  in the file PATENTS.  All contributing project authors may
+##  be found in the AUTHORS file in the root of the source tree.
+##
+
 sub vpx_dsp_forward_decls() {
 print <<EOF
 /*

vpx_scale/vpx_scale_rtcd.pl

+##
+##  Copyright (c) 2017 The WebM project authors. All Rights Reserved.
+##
+##  Use of this source code is governed by a BSD-style license
+##  that can be found in the LICENSE file in the root of the source
+##  tree. An additional intellectual property rights grant can be found
+##  in the file PATENTS.  All contributing project authors may
+##  be found in the AUTHORS file in the root of the source tree.
+##
+
 sub vpx_scale_forward_decls() {
 print <<EOF
 struct yv12_buffer_config;