Fix sdist with data files change in #261

sassutils/distutils.py

@@ -193,11 +193,8 @@ def check_readme(self):
         except AttributeError:
             pass
         else:
-            try:
-                join = os.path.join
-            except AttributeError:
-                from os.path import join  # XXX: workaround
-            self.filelist.extend(join(*pair) for pair in files)
+            for _, css_files in files:
+                self.filelist.extend(css_files)
         return self._wrapped_check_readme()
     sdist._wrapped_check_readme = sdist.check_readme
     sdist.check_readme = check_readme