Jaraco.packaging

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7, 10, 11: Added environment variable to bypass
building metadata for offline builds.

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6: Added minimal test to ``sphinx.packaging``.

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Change requirement to ``build[virtualenv]`` as workaround for
`pypa/build266 <https://github.com/pypa/build/issues/266>`_.

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Prefer ``build`` to ``pep517`` for loading package metadata.

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Use pep517.meta to load package metadata. Adds support
for packages without setup.py.

Removed info module (and setuptools show command).

Removed depends module. Use other packaging tools instead.

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Rely on PEP 420 for namespace package.