[Distutils] setuptools unittests on Mac OS X

[Ashley Walsh]

Just a small fix to make the  
setuptools.tests.test_resources.DistroTests.testCollection pass on  
OSX (and other non-win32 platforms):

diff -r1.25 test_resources.py
26c26
<         ad = Environment([], python=None)
---
 >         ad = Environment([], platform='win32', python=None)

Without this the Environment uses the get_platform() result, and  
Distribution.from_filename("FooPkg-1.4-py2.4-win32.egg") is not added  
to the environment.  (Maybe some can_add() tests would help?)

Cheers,
Ashley