automation: set PATH when building on Windows Sometime in the 6.2 release cycle the Windows building automation broke. Building the wheel and even PyOxidizer based installers now fails with: ``` Exception: PowerShell execution failed: error: subprocess-exited-with-error Getting requirements to build wheel did not run successfully. exit code: 1 [1 lines of output] Unable to find a working hg binary to extract the version from the repository tags [end of output] note: This error originates from a subprocess, and is likely not a problem with pip. ``` I have a hunch this is a regression from upgrading pip in 1c00777702da, but I haven't verified this. It may not be, as PyOxidizer has its own bundled Python/pip. So maybe it is something in `setup.py`.

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[build-system]

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requires = ["setuptools", "wheel"]

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[tool.black]

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line-length = 80

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exclude = '''

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build/

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| wheelhouse/

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| dist/

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| packages/

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| \.hg/

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| \.mypy_cache/

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| \.venv/

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| mercurial/thirdparty/

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'''

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skip-string-normalization = true

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quiet = true