Windows has no os.uname. Use platform.uname() instead.

Lib/test/test_platform.py

@@ -65,7 +65,7 @@ class PlatformTest(unittest.TestCase):
     def test_mac_ver(self):
         res = platform.mac_ver()
 
-        if os.uname()[0] == 'Darwin':
+        if platform.uname()[0] == 'Darwin':
             # We're on a MacOSX system, check that
             # the right version information is returned
             fd = os.popen('sw_vers', 'r')