pyoxidizer: make sure defaultrc directory exists before trying to write to it
When doing some work involving one-file binaries, this line is failing
for me. It seems reasonable to just make sure the destination
directory exists before splatting the file into it.
Differential Revision: https://phab.mercurial-scm.org/D9401
[tool.black]
line-length = 80
exclude = '''
build/
| wheelhouse/
| dist/
| packages/
| \.hg/
| \.mypy_cache/
| \.venv/
| mercurial/thirdparty/
'''
skip-string-normalization = true
quiet = true