Add a snapshot of flutter/engine/src/build to our sdk

build/linux/unbundle/libvpx.gyp

+# Copyright 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+{
+  'targets': [
+    {
+      'target_name': 'libvpx',
+      'type': 'none',
+      'direct_dependent_settings': {
+        'cflags': [
+          '<!@(pkg-config --cflags vpx)',
+        ],
+      },
+      'variables': {
+        'headers_root_path': 'source/libvpx',
+        'header_filenames': [
+          'vpx/vp8.h',
+          'vpx/vp8cx.h',
+          'vpx/vp8dx.h',
+          'vpx/vpx_codec.h',
+          'vpx/vpx_codec_impl_bottom.h',
+          'vpx/vpx_codec_impl_top.h',
+          'vpx/vpx_decoder.h',
+          'vpx/vpx_encoder.h',
+          'vpx/vpx_frame_buffer.h',
+          'vpx/vpx_image.h',
+          'vpx/vpx_integer.h',
+        ],
+      },
+      'includes': [
+        '../../build/shim_headers.gypi',
+      ],
+      'link_settings': {
+        'ldflags': [
+          '<!@(pkg-config --libs-only-L --libs-only-other vpx)',
+        ],
+        'libraries': [
+          '<!@(pkg-config --libs-only-l vpx)',
+        ],
+      },
+    },
+  ],
+}