Setuptools

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Features
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- Restore access to _get_vc_env with a warning. (4874)

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Bugfixes
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- Postponed removals of deprecated dash-separated and uppercase fields in ``setup.cfg``.
All packages with deprecated configurations are advised to move before 2026. (4911)

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Misc
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- 4909

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Bugfixes
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- Reverted distutils changes that broke the monkey patching of command classes. (4902)


Deprecations and Removals
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- Setuptools no longer accepts options containing uppercase or dash characters in ``setup.cfg``.
Please ensure to write the options in ``setup.cfg`` using the :wiki:`lower_snake_case <Snake_case>` convention
(e.g. ``Name => name``, ``install-requires => install_requires``).
This is a follow-up on deprecations introduced in
`v54.1.0 <https://setuptools.pypa.io/en/latest/history.html#v54-1-0>`_ (see 1608) and
`v54.1.1 <https://setuptools.pypa.io/en/latest/history.html#v54-1-1>`_ (see 2592).

.. note::
This change *does not affect configurations in* ``pyproject.toml``
(which uses the :wiki:`lower-kebab-case <Letter_caseKebab_case>` convention following the precedent set in :pep:`517`/:pep:`518`). (4870)


Misc
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- 4904

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Bugfixes
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- Temporarily convert error for license glob patterns containing ``../`` into a deprecation warning
to allow an accomodation period. (4896)
- Better error messages for ``packaging.licenses`` import errors in environments with ``packaging<24.2``\.
The import statement was also deferred to spare users that are not using
license expressions. (4898)
- Avoided eagerly raising an exception when ``license-files`` is defined
simultaneously inside and outside of ``pyproject.toml``.
Instead we rely on the existing deprecation error. (4899)

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Bugfixes
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- Restore ``distutils.ccompiler._default_compilers`` -- by :user:`ManiacDC` (4876)
- Fixed copy pasta in ``msvc.shared_lib_format``\. (4885)