fix: fix Windows build.dart

docs/quickstart.mdx

@@ -14,6 +14,8 @@ This is a simplified, Flutter-only wrapper around the underlying 3D rendering AP
 
 Follow the steps listed in [Getting Started](./getting_started) to configure your Flutter installation and project.
 
+If you're running Windows, delete the `examples/flutter/quickstart/assets` symlink and copy the `assets` folder from `examples/assets` to `examples/flutter/quickstart/assets`.
+
 ## Basic Usage
 
 ```dart

thermion_dart/hook/build.dart

@@ -131,7 +131,7 @@ void main(List<String> args) async {
 
     var frameworks = [];
 
-    if (platform != "windows") {
+    if (targetOS != OS.windows) {
       flags.addAll(['-std=c++17']);
     } else {
       defines["WIN32"] = "1";
@@ -194,7 +194,7 @@ void main(List<String> args) async {
       name: packageName,
       language: Language.cpp,
       assetName: 'thermion_dart.dart',
-      sources: platform == "windows" ? [] : sources,
+      sources: targetOS == OS.windows ? [] : sources,
       includes: platform == "windows"
           ? []
           : ['native/include', 'native/include/filament'],
@@ -220,12 +220,12 @@ void main(List<String> args) async {
           "/I${path.join(pkgRootFilePath, "native", "include", "windows", "vulkan")}",
           "@${srcs.uri.toFilePath(windows: true)}",
           // ...sources,
-          '/link',
-          "/LIBPATH:$libDir",
-          '/DLL',
+          // '/link',
+          // "/LIBPATH:$libDir",
+          // '/DLL',
         ]
       ],
-      dartBuildFiles: ['hook/build.dart'],
+      libraryDirectories: [libDir],
     );
 
     await cbuilder.run(

thermion_dart/native/include/ThermionWin32.h

@@ -25,7 +25,6 @@
 #pragma comment(lib, "dracodec.lib")
 #pragma comment(lib, "ibl.lib")
 #pragma comment(lib, "ktxreader.lib")
-#pragma comment(lib, "png.lib")
 #pragma comment(lib, "z.lib")
 #pragma comment(lib, "stb.lib")
 #pragma comment(lib, "uberzlib.lib")

thermion_dart/native/include/c_api/TCamera.h

@@ -1,5 +1,9 @@
 #pragma once
 
+#ifdef _WIN32
+#include "ThermionWin32.h"
+#endif
+
 #ifdef __cplusplus
 namespace thermion {
 extern "C"