[BUG] No module named '_sysconfigdata_d_linux_x86_64-linux-gnu'

### setuptools version

setuptools==60.0.0

### Python version

Python 3.9

### OS

Ubuntu 20.04

### Additional environment information

Can reproduce in Docker or with deadsnakes action.

### Description

Today, 3.9 deadsnakes debug builds on GitHub Actions for pybind11 started failing with `ModuleNotFoundError: No module named '_sysconfigdata_d_linux_x86_64-linux-gnu'. Setting `SETUPTOOLS_USE_DISTUTILS=stdlib` fixes it.



Logs: https://github.com/pybind/pybind11/runs/4583094186?check_suite_focus=true



Original report: https://github.com/deadsnakes/issues/issues/188

### Expected behavior

It should be possible to use setuptools and sysconfig on Python 3.9 debug builds! :)

### How to Reproduce

`deadsnakes/action@v2.1.1` on `ubuntu-latest`, GHA, followed by the final line below. Or it can be reproduced in Docker. Here is a MWE:



```console

$ docker run --rm -it ubuntu:20.04

# apt update && apt install software-properties-common -y

# add-apt-repository ppa:deadsnakes/ppa && apt update && apt install -y python3.9-dev python3.9-dbg python3.9-venv python3.9-distutils

# python3.9-dbg -m venv .venv

# ./.venv/bin/python -m pip install -U pip setuptools wheel

# ./.venv/bin/python -c "import setuptools; from distutils import sysconfig as s; s.get_config_var('LDVERSION')"

```

### Output

```pytb

Traceback (most recent call last):

  File "/.venv/lib/python3.9/site-packages/setuptools/_distutils/sysconfig.py", line 488, in _init_posix

    _temp = __import__(name, globals(), locals(), ['build_time_vars'], 0)

ModuleNotFoundError: No module named '_sysconfigdata_d_linux_x86_64-linux-gnu'



During handling of the above exception, another exception occurred:



Traceback (most recent call last):

  File "<string>", line 1, in <module>

  File "/.venv/lib/python3.9/site-packages/setuptools/_distutils/sysconfig.py", line 601, in get_config_var

    return get_config_vars().get(name)

  File "/.venv/lib/python3.9/site-packages/setuptools/_distutils/sysconfig.py", line 532, in get_config_vars

    func()

  File "/.venv/lib/python3.9/site-packages/setuptools/_distutils/sysconfig.py", line 491, in _init_posix

    _temp = __import__(

ModuleNotFoundError: No module named '_sysconfigdata'

```

### Code of Conduct

- [X] I agree to follow the PSF Code of Conduct

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