os.execute not behaving correctly on windows

[tsukinoko-kun]

You must post issues only here. Questions, ideas must be posted in discussions.

• [x] GopherLua is a Lua5.1 implementation. You should be familiar with Lua programming language. Have you read Lua 5.1 reference manual carefully?
• [x] GopherLua is a Lua5.1 implementation. In Lua, to keep it simple, it is more important to remove functionalities rather than to add functionalities unlike other languages . If you are going to introduce some new cool functionalities into the GopherLua code base and the functionalities can be implemented by existing APIs, It should be implemented as a library.

Please answer the following before submitting your issue:

1. What version of GopherLua are you using? : v1.1.2-0.20231212122839-2348fd042596
2. What version of Go are you using? : 1.21.3
3. What operating system and processor architecture are you using? : windows amd64
4. What did you do? : os.execute('echo "hello world"')
5. What did you expect to see? : "hello world"
6. What did you see instead? : \"hello world\"