[issue45847] Port module setup to PY_STDLIB_MOD() macro and addext()

[Anthony Sottile]

Anthony Sottile <asottile at umich.edu> added the comment:

the `tk-dev` package on ubuntu bionic does not ship with a `pkg-config` file for tk so it does not build properly there: 

```
root at f0dd06a3e87c:/cpython# dpkg -L tk8.6-dev | grep pc
root at f0dd06a3e87c:/cpython# 
```

(a note: bionic reaches end of life in april 2023 so it is likely to still see significant use until then)

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<https://bugs.python.org/issue45847>
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