compilation error with wasm docker

```
error: Error listing dir "/rustpython/vm/../Lib/": No such file or directory (os error 2)
  --> vm/src/frozen.rs:21:45
   |
21 |         modules.extend(py_compile_bytecode!(dir = "../Lib/",));
   |                        ---------------------^^^^^^^^^^^^^^^-- in this macro invocation

error: aborting due to previous error

error: Could not compile `rustpython-vm`.
```