Use unicode from compat module

--HG--
branch : distribute
extra : rebase_source : c4dd03dba58146eed2f620cd6d6b7ab52ee9d109
extra : histedit_source : 02c194ea1c97e8aea64fd23d77efc1bade185c0a

setuptools/tests/test_sdist.py

@@ -9,7 +9,7 @@ import tempfile
 import unittest
 import unicodedata
 
-from setuptools.compat import StringIO
+from setuptools.compat import StringIO, unicode
 from setuptools.command.sdist import sdist
 from setuptools.command.egg_info import manifest_maker
 from setuptools.dist import Distribution
@@ -55,7 +55,7 @@ def b(s, encoding='utf-8'):
 
 # Convert to POSIX path
 def posix(path):
-    if sys.version_info >= (3,) and not isinstance(path, unicode):
+    if sys.version_info >= (3,) and not isinstance(path, str):
         return path.replace(os.sep.encode('ascii'), b('/'))
     else:
         return path.replace(os.sep, '/')