Fix Windows tests

Author: barneygale

Lib/test/test_urllib.py

@@ -1549,7 +1549,7 @@ def test_pathname2url_win(self):
         self.assertEqual(fn('//?/unc/server/share/dir'), '//server/share/dir')
         # Round-tripping
         urls = ['///C:',
-                '///folder/test/',
+                '/folder/test/',
                 '///C:/foo/bar/spam.foo']
         for url in urls:
             self.assertEqual(fn(urllib.request.url2pathname(url)), url)