Wheels are installed to the wrong location (root install)

[connorjward]

The wheel files are installed to the wrong location when installed using the root user (which we are doing inside a Docker container).

Steps to reproduce:

1. docker run -it ubuntu:latest
2. apt update && apt install python3-pip
3. pip install --break-system-packages netgen-mesher
4. ls /usr/local/lib/python3.12/

The expected outcome is for the files to be installed into /usr/local/lib/python3.12/dist-packages (which is what numpy does for example) but they are actually being put into /usr/local/lib/python3.12/site-packages which means that they cannot be found. I.e.

$ python -c "import netgen"

raises a ModuleNotFoundError. This can be worked around by setting PYTHONPATH=/usr/local/lib/python3.12/site-packages but that isn't ideal.

Looking at the contents of /netgen_mesher-6.2.2501.dist-info/RECORD in the wheel I see site-packages hard-coded for some of the paths which I think isn't right.