[Distutils] fix setup_requires by allowing it in setup.cfg or a setup_requires.txt

[Marcus Smith]

>
> I'm of course hoping that someone uses the feature to do a
> setup.py-command-line-interface-compatible distutils replacement
> (rather than a distutils extension) like what Bento does with its
> pip-compatible setup.py replacement.
>

ah, I see.  interesting.
I admit my initial reaction to "quack like a setup.py" alternative build
systems is that it sounds invasive and sneaky, and I want it to be explicit
and overt,  like it will be in metadata 2.X.
but on the other hand,  I hear you about wanting to see alternatives have
some way to get off the ground now.
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