Pass through PROGRAMDATA, PROGRAMFILES env variables

[isuruf]

Fixes #118

[jaraco]

I've been debating in my mind whether to go with the proposed approach or something like this instead:

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 6fca2f69f4..68f9944eca 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -9,6 +9,8 @@ concurrency:
 env:
   # pypa/distutils#99
   VIRTUALENV_NO_SETUPTOOLS: 1
+  # tox-dev/tox#2382
+  TOX_TESTENV_PASSENV: ProgramFiles ProgramFiles(x86) ProgramData
 
 jobs:
   test:

The nice thing about the proposed patch is that it would also apply to users testing distutils on Windows locally (outside CI). The nice thing about the CI config is that it applies broadly to all tox environments so is more applicable to all Github Actions, plus it happens on one line, so easier to document.

I don't intend either workaround to be around long term, so let's go with this one for now.