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/pubspec.yaml

@@ -0,0 +1,48 @@
+name: media_kit_video
+description: Native implementation for video playback in package:media_kit.
+homepage: https://github.com/media-kit/media-kit
+repository: https://github.com/media-kit/media-kit
+version: 2.0.1
+topics:
+  - video
+  - video-player
+  - audio
+  - audio-player
+  - cross-platform
+
+environment:
+  sdk: ">=2.17.0 <4.0.0"
+  flutter: ">=3.7.0"
+
+dependencies:
+  flutter:
+    sdk: flutter
+
+  media_kit: ^1.2.3
+
+  synchronized: ^3.1.0
+  wakelock_plus: ^1.1.6
+  universal_platform: ^1.0.0+1
+  plugin_platform_interface: ^2.0.2
+  web: ^1.1.0
+
+dev_dependencies:
+  flutter_lints: ^5.0.0
+
+
+
+flutter:
+  plugin:
+    platforms:
+      windows:
+        pluginClass: MediaKitVideoPluginCApi
+      linux:
+        pluginClass: MediaKitVideoPlugin
+      macos:
+        pluginClass: MediaKitVideoPlugin
+      ios:
+        pluginClass: MediaKitVideoPlugin
+      android:
+        package: com.alexmercerind.media_kit_video
+        pluginClass: MediaKitVideoPlugin
+      web: