[Distutils] Disabling --single-version-externally-managed

[Toshio Kuratomi]

Toshio Kuratomi wrote:
> 
> This code creates an unordered list because you might have already had
> to place something after one of the duplicate locations that this code
> is removing.  We need to do a sort of the entire list after each add +
> duplicate removal run.

Here's a quick and dirty patch.  It's correct but it's inefficient.  A
better sort algorithm would help some.  Refactoring code so we call a
sort method after we finish adding entries to the path would be even better.

I'll test how this affects packaging tonight.

-Toshio
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