Vendor media_kit_video 2.0.1 with the X11/EGL fix (hardware rendering on X11 with Flutter >= 3.38)

Flutter >= 3.38 keeps its EGL contexts on the raster thread, so
media_kit's video output found none on the platform thread and fell
back to software rendering (no shaders, ~5 fps) on X11. The patched
output opens Flutter's EGL display itself, steps GDK's GLX context aside
on X11 and releases its own context. Patch from a friend's agent, kept
in third_party/media_kit_video/starsync/. Wayland/NVIDIA still renders
on the GPU (checked); the X11 path was verified on the friend's machine.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

third_party/media_kit_video/windows/utils.h

@@ -0,0 +1,33 @@
+// This file is a part of media_kit
+// (https://github.com/media-kit/media-kit).
+//
+// Copyright © 2021 & onwards, Hitesh Kumar Saini <saini123hitesh@gmail.com>.
+// All rights reserved.
+// Use of this source code is governed by MIT license that can be found in the
+// LICENSE file.
+
+#ifndef UTILS_H_
+#define UTILS_H_
+
+#include <cstdint>
+
+#include <Windows.h>
+
+class Utils {
+ public:
+  static void EnterNativeFullscreen(HWND window);
+
+  static void ExitNativeFullscreen(HWND window);
+
+  static RTL_OSVERSIONINFOW GetWindowsVersion();
+
+  static bool IsWindows10RTMOrGreater();
+
+ private:
+  static constexpr auto kFlutterViewWindowClassName = L"FLUTTERVIEW";
+
+  static bool fullscreen_;
+  static RECT rect_before_fullscreen_;
+};
+
+#endif  // UTILS_H_