Setuptools

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Changes
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* 2640: Fixed handling of multiline license strings. - by :user:`cdce8p`
* 2641: Setuptools will now always try to use the latest supported
metadata version for ``PKG-INFO``. - by :user:`cdce8p`

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Changes
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* 2653: Incorporated assorted changes from pypa/distutils.
* 2657: Adopted docs from distutils.
* 2663: Added Visual Studio Express 2017 support -- by :user:`dofuuz`

Misc
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* 2644: Fixed ``DeprecationWarning`` due to ``threading.Thread.setDaemon`` in tests -- by :user:`tirkarthi`
* 2654: Made the changelog generator compatible
with Towncrier >= 19.9 -- :user:`webknjaz`
* 2664: Relax the deprecation message in the distutils hack.

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Deprecations
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* 2620: The ``license_file`` option is now marked as deprecated.
Use ``license_files`` instead. -- by :user:`cdce8p`

Breaking Changes
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* 2620: If neither ``license_file`` nor ``license_files`` is specified, the ``sdist``
option will now auto-include files that match the following patterns:
``LICEN[CS]E*``, ``COPYING*``, ``NOTICE*``, ``AUTHORS*``.
This matches the behavior of ``bdist_wheel``. -- by :user:`cdce8p`

Changes
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* 2620: The ``license_file`` and ``license_files`` options now support glob patterns. -- by :user:`cdce8p`
* 2632: Implemented ``VendorImporter.find_spec()`` method to get rid
of ``ImportWarning`` that Python 3.10 emits when only the old-style
importer hooks are present -- by :user:`webknjaz`

Documentation changes
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* 2620: Added documentation for the ``license_files`` option. -- by :user:`cdce8p`

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Breaking Changes
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* 2566: Remove the deprecated ``bdist_wininst`` command. Binary packages should be built as wheels instead. -- by :user:`hroncok`

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Changes
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* 2608: Added informative error message to PEP 517 build failures owing to
an empty ``setup.py`` -- by :user:`layday`

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No significant changes.