fix: set VSCMD_ARG_TGT_ARCH based on targeted architecture (#1876)

* set VSCMD_ARG_TGT_ARCH based on targetted architecture

* only set VSCMD_ARG_TGT_ARCH if not already set

* add unit tests to check setuptools correctly identifies windows arch

* only run tests on windows

* arm64 fails on azure pipelines (only)

* Update windows.py

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Apply suggestions from code review

Co-authored-by: Joe Rickerby <joerick@mac.com>

* update test_env_set to validate FatalError is raised on env collision

* remove noqa ARG001 (no longer needed)

---------

Co-authored-by: Henry Schreiner <HenrySchreinerIII@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Joe Rickerby <joerick@mac.com>

pyproject.toml

@@ -75,6 +75,7 @@ test = [
     "pytest-timeout",
     "pytest-xdist",
     "pytest>=6",
+    "setuptools",
     "tomli_w",
     "validate-pyproject",
 ]
@@ -140,6 +141,8 @@ disallow_untyped_decorators = true
 [[tool.mypy.overrides]]
 module = [
     "setuptools",
+    "setuptools._distutils", # needed even if only directly import setuptools._distutils.util
+    "setuptools._distutils.util",
     "pytest", # ignored in pre-commit to speed up check
     "bashlex",
     "bashlex.*",