[Distutils] Provisionally accepting PEP 517's declarative build system interface

[Thomas Kluyver]

What about saying that the copying step, if necessary, is part of the
build backend's responsibilities? I.e. pip doesn't copy the whole
directory to a temporary build location, but the build backend may
decide to do that at its discretion when it's asked to build a wheel.
pip would continue to handle this for setup.py builds.
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