In certain environments (notably, the [bazel sandbox](https://bazel.build/docs/sandboxing) on windows), it is possible for `pathlib.Path('~').expanduser()` to fail to find the user home directory and [raise a `RuntimeError`](https://docs.python.org/3/library/pathlib.html#pathlib.Path.expanduser). This causes `distutils` (and ultimately, `setuptools`) to fail.

With this patch, we catch and handle the exception by logging a warning and continuing without a user's config file.

motivated by bazelbuild/rules_python#1067

Co-authored-by: Anderson Bravalheri <andersonbravalheri+github@gmail.com>