When calculating the install paths in the Python module, if a sysconfig path is not relative to install prefix, Meson will have the wrong path. Change the sysconfig paths on the Python interpreter to ...

-p/--python with relative paths is broken due to using normalize_path, which changes the path rather than just normalizing it. $ cargo run -q -- venv -p ../cpython/python .venv3.13 -vv uv_interpreter: ...