fix non-unix chmod

Author: fi3ework

tests/rspack-test/configCases/rslib/hashbang-and-chmod/test.js

@@ -15,7 +15,11 @@ testCases.forEach(({ name, file }) => {
 		expect(content.startsWith('#!/usr/bin/env node\n')).toBe(true);
 	});
 
-	it (`should set executable permissions (0o755) for files with hashbang (${name})`, () => {
+	// File permissions (chmod) are only supported on Unix-like systems (Linux, macOS, BSD, etc.).
+	// Skip on Windows and WASM environments where Unix permissions are not supported.
+	const itOnUnixOnly = (process.platform !== 'win32' && !process.env.WASM) ? it : it.skip;
+	
+	itOnUnixOnly(`should set executable permissions (0o755) for files with hashbang (${name})`, () => {
 		const filePath = path.resolve(__dirname, file);
 		const stats = fs.statSync(filePath);
 		const permissions = stats.mode & 0o777;