In a prior commit, I mistakenly used "architecture: x64" instead of
"architecture: x86", and tests actually passed.
That was surprising, because netifaces do not have amd64_win will on
PyPI. But mystery was solved when itamarst pointed out that netifaces
wheel (that we previously built) is present on pip cache.
But pip cache might be purged one day, and tests will fail again that
day. We can't have that, so we will try to stick with x86 for now.
I can't figure out the correct GitHub Actions magic incantation^w^w
expression syntax that is needed to isolate (Windows && Python 2.7),
so let's just run also run x86 Python 3.6 on Windows.
Per GitHub documentation:
When you use expressions in an if conditional, you may omit the
expression syntax (${{ }}) because GitHub automatically evaluates
the if conditional as an expression, unless the expression contains
any operators. If the expression contains any operators, the
expression must be contained within ${{ }} to explicitly mark it for
evaluation.
https://docs.github.com/en/actions/reference/context-and-expression-syntax-for-github-actions
