[native_toolchain_c] Fix handle spaces in the path to the cl.exe compiler

When the Visual Studio C++ compiler (cl.exe) is installed in a path
containing spaces (e.g., the default "C:\Program Files\Microsoft Visual
Studio\2022\..."), the build system failed to execute it correctly.

The command was invoked without proper quoting, leading to an error:
  'C:\Program' is not recognized as an internal or external command

This commit ensures that the path to cl.exe is properly quoted when
invoking the compiler, allowing builds to succeed on systems with a
standard Visual Studio installation.

Author: dongfengweixiao

pkgs/native_toolchain_c/lib/src/utils/run_process.dart

@@ -41,7 +41,9 @@ Future<RunProcessResult> runProcess({
     arguments,
     workingDirectory: workingDirectory?.toFilePath(),
     environment: environment,
-    runInShell: Platform.isWindows && workingDirectory != null,
+    runInShell: executable.toFilePath().contains(' ')
+        ? false
+        : Platform.isWindows && workingDirectory != null,
   );
 
   final stdoutSub = process.stdout.listen((List<int> data) {