build directory maybe not good

```bash
llpyg torch        
torch 2.8.0 is ready
go: creating new go.mod: module torch
go: added github.com/goplus/lib v0.3.0
Generating LLGo bindings for torch...
LLGo bindings generated successfully in /Users/zhangzhiyang/Documents/Code/goplus/llpyg/test/torch
```

maybe the build or dist dir is more common