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

build/linux/unbundle/speex.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': 'libspeex',
+      'type': 'none',
+      'variables': {
+        'headers_root_path': 'include',
+        'header_filenames': [
+          'speex/speex_types.h',
+          'speex/speex_callbacks.h',
+          'speex/speex_config_types.h',
+          'speex/speex_stereo.h',
+          'speex/speex_echo.h',
+          'speex/speex_preprocess.h',
+          'speex/speex_jitter.h',
+          'speex/speex.h',
+          'speex/speex_resampler.h',
+          'speex/speex_buffer.h',
+          'speex/speex_header.h',
+          'speex/speex_bits.h',
+        ],
+      },
+      'includes': [
+        '../../build/shim_headers.gypi',
+      ],
+      'direct_dependent_settings': {
+        'cflags': [
+          '<!@(pkg-config --cflags speex)',
+        ],
+      },
+      'link_settings': {
+        'ldflags': [
+          '<!@(pkg-config --libs-only-L --libs-only-other speex)',
+        ],
+        'libraries': [
+          '<!@(pkg-config --libs-only-l speex)',
+        ],
+      },
+    },
+  ],
+}