[WIP]Update Flutter 3.38.3 #19
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flutter-tizen/flutter-tizen#554 Added x64 artifacts for x64 emulator support (Currently, x64 Release mode is only supported on Linux hosts.)
flutter engine's window build uses Window SDKs 10.0.22621.0. window-2025 runner in gitHub actions no longer supports the 10.0.22621.0 SDK.
Add new struct FlutterVulkanTexture for embedder :
```
typedef struct {
/// Handle to the VkImage that is owned by the embedder. The engine will
/// bind this image for writing the frame.
FlutterVulkanImageHandle image;
/// The VkDeviceMemory that backs the iamge.
FlutterVulkanDeviceMemoryHandle image_memory;
/// The VkFormat of the image (for example: VK_FORMAT_R8G8B8A8_UNORM).
uint32_t format;
/// User data to be returned on the invocation of the destruction callback.
void* user_data;
/// Callback invoked (on an engine managed thread) that asks the embedder to
/// collect the texture.
VoidCallback destruction_callback;
/// Optional parameters for texture height/width, default is 0, non-zero means
/// the texture has the specified width/height.
/// Width of the texture.
size_t width;
/// Height of the texture.
size_t height;
} FlutterVulkanTexture;
```
The implement of [texture
source](https://github.com/flutter-tizen/flutter/pull/17/files#diff-7955a8522a753162869f2e8ca0017a83f4854b60800c844202e70c3aa00ff0c9R5-R204)
refer to the solution of android
platform(https://github.com/flutter-tizen/flutter/blob/flutter-3.35.3/engine/src/flutter/impeller/renderer/backend/vulkan/android/ahb_texture_source_vk.cc)
and I have submitted the code [Support render texture for
embedder](xiaowei-guan/embedder@6a94746),
I will create a new PR after[ support vulkan
backend](flutter-tizen/embedder#110) PR
released.
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--no-ltogn option.fltofor linux was added but it have been disabled in Flutter CI due to build performance issues.