Use `pybuilddir.txt` to find `_sysconfigdata` for the WASI build script

[brettcannon]

cpython/Platforms/WASI/__main__.py

Line 328 in 957f9fe

f"{wasi_build_dir}/build/lib.wasi-wasm32-{python_version}"

That should be reading the directory location from pybuilddir.txt instead.

Linked PRs

• gh-144533: Use pybuilddir.txt to find _sysconfigdata for WASI #144535