`os.access` raises where CPython would return `False`

snippet:

```python
import os
os.access("/does/not/exists", os.X_OK)
```

CPython:
```python
False
```

RustPython:
```python-traceback
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
FileNotFoundError: (2, 'No such file or directory (os error 2)')
```