`Exception.__init__.__qualname__` is incorrectly set to `'BaseException.__init__'`

## Feature

CPython:

```pycon
Python 3.9.4 (default, Apr  5 2021, 01:47:16) 
[Clang 11.0.0 (clang-1100.0.33.17)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> Exception.__init__.__qualname__
'Exception.__init__'
```

RustPython:

```
Welcome to the magnificent Rust Python 0.1.2 interpreter 😱 🖖
>>>>> Exception.__init__.__qualname__
'BaseException.__init__'
```


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`Exception.init.qualname` is incorrectly set to `'BaseException.init'` #2771

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Exception.__init__.__qualname__ is incorrectly set to 'BaseException.__init__' #2771

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`Exception.init.qualname` is incorrectly set to `'BaseException.init'` #2771