[issue5052] Mark distutils to stay compatible with 2.3

[Tarek Ziadé]

Tarek Ziadé <ziade.tarek at gmail.com> added the comment:

ok the current trunk won't run even under 2.5...

I will make two small changes:

- use md5 module of haslib is not found
- make the smallest possible change for site.USER_BASE 
  and site.USER_SITE usage

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nosy: +christian.heimes

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<http://bugs.python.org/issue5052>
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