PEP 518 support ignore extras in build requirements

[benoit-pierre]

• Pip version: 10
• Python version: 3.6
• Operating system: Arch Linux

Description:

For the same underlying reasons as #5230, extras in build requirements are simply ignored.

Steps to reproduce:

> rm -rf sample_project
> mkdir sample_project
> printf 'import setuptools; setuptools.setup(name="sample_project", version="0.1")\n' >sample_project/setup.py
> printf '[build-system]\nrequires = ["wheel", "setuptools", "requires_simple_extra[extra]"]\n' >sample_project/pyproject.toml
> rm -rf tmp && PYTHONPATH=$PWD/src python -m pip install -t tmp -f tests/data/packages/ ./sample_project
Looking in links: tests/data/packages/
Processing ./sample_project
  Installing build dependencies ... done
Building wheels for collected packages: sample-project
  Running setup.py bdist_wheel for sample-project ... done
  Stored in directory: /tmp/pip-ephem-wheel-cache-y9t4gjis/wheels/f1/39/94/a966d73011f6634dd4d5546764ef9d85816b44b36f176032a5
Successfully built sample-project
Installing collected packages: sample-project
Successfully installed sample-project-0.1

The last command should fail because tests/data/packages does not contain a wheel for simple==1.0.

[lock]

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