[RFC] Add support to virtualenv for out implementation of pypy

[David Naylor]

Hi,

The version of pypy in ports is not a standard version, as it tries to follow 
the directory layout of python and not have everything in its own 
subdirectory.  

As a result of this virtualenv support does not work.  A large portion of the 
problem is that virtualenv hard codes directory paths that it should be 
deducing from the python libraries (such as sysconfig or distutils.sysconfig).  

Please find attached for a patch that adds support for our pypy to virtualenv, 
I have tried to do it in a manor that is generic and should be upstreamable 
(except for some site-packages) related stuff.  

When testing this please use lang/pypy-devel, or apply the sysconfig.py patch 
- also attached - to the sysconfig.py found in /usr/local/lib/pypy-2.2.  

Regards
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