[Distutils] Extension: Entry-Point

[Daniel Holth]

> I don't see the point of jamming all metadata into a single file.
> Well, I mean, I do see it if you want to pull a single file off of
> PyPI and know everything about a distribution.
>
> But for runtime performance, separate files are better because then
> you don't have to actually read them for a bunch of projects with no
> entry points.  Putting the entry points in a file that *every*
> installed distribution has is going to positively murder the
> performance.

Agreed. I will let entry_points.txt stay as is.