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

build/some.gyp

+# Copyright (c) 2011 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': 'some',
+      'type': 'none',
+      'dependencies': [
+        # This file is intended to be locally modified. List the targets you use
+        # regularly. The generated some.sln will contains projects for only
+        # those targets and the targets they are transitively dependent on. This
+        # can result in a solution that loads and unloads faster in Visual
+        # Studio.
+        #
+        # Tip: Create a dummy CL to hold your local edits to this file, so they
+        # don't accidentally get added to another CL that you are editing.
+        #
+        # Example:
+        # '../chrome/chrome.gyp:chrome',
+      ],
+    },
+  ],
+}