regression: editable packages not showing up correctly in --list-all

[virtuald]

I bisected to 0325313 as the breaking change. The key difference in the PKG_CONFIG_PATH shows what's happening:

Works:

% pkgconf --list-all
> Running the Python pkgconf
> $ PKG_CONFIG_PATH=:/Users/virtuald/projects/semiwrap/examples/demo/swdemo:/Users/virtuald/projects/semiwrap/src/semiwrap:/Users/virtuald/projects/mostrobotpy/subprojects/native.wpiutil/src/native/wpiutil /Users/virtuald/.virtualenvs/myvenv/lib/python3.13/site-packages/pkgconf/.bin/pkgconf --list-all

Does not works:

% pkgconf --list-all
> Running the Python pkgconf
> $ PKG_CONFIG_PATH=:/Users/virtuald/.virtualenvs/myvenv/lib/python3.13/site-packages/swdemo:/Users/virtuald/.virtualenvs/myvenv/lib/python3.13/site-packages/semiwrap:/Users/virtuald/.virtualenvs/myvenv/lib/python3.13/site-packages/native/wpiutil /Users/virtuald/.virtualenvs/myvenv/lib/python3.13/site-packages/pkgconf/.bin/pkgconf --list-all

I'm using hatching in editable mode, and it seems that it's finding the site-packages directory and not where the package actually lives (which is where the .pc files are).

[FFY00]

Ah, and that's why we needed to go through the import system to resolve the path 🤦

I'll fix it. It seems we have to bring back the import resolution, but run it in a separate process.

[virtuald]

I don't understand why it needs to be done in an external process?