rust-cpython: don't swallow the dirstate error message
In case we do get a dirstate error, we want to get the full error message and
not just an opaque `Dirstate error`.
[build-system]
requires = ["setuptools", "wheel"]
[tool.black]
line-length = 80
exclude = '''
build/
| wheelhouse/
| dist/
| packages/
| \.hg/
| \.mypy_cache/
| \.venv/
| mercurial/thirdparty/
'''
skip-string-normalization = true
quiet = true