[Distutils] easy_install finding wrong platform

[Charlie Moad]

For matplotlib I have pypi's download url set to
"http://sourceforge.net/project/showfiles.php?group_id=80706&package_id=82474".
 All the files are over the 5MB limit in case anyone asks.  When I run
"easy_install -U matplotlib" on windows 2.4 it is downloading the
"matplotlib-0.87.2-py2.4-macosx10.4.mpkg.zip" file instead of
"matplotlib-0.87.2-py2.4-win32.egg".  Obviously wrong.

Thanks,
     Charlie