Remove Python 2.3 compatibility support

ez_setup.py

@@ -316,13 +316,7 @@ def _extractall(self, path=".", members=None):
         self.extract(tarinfo, path)
 
     # Reverse sort directories.
-    if sys.version_info < (2, 4):
-        def sorter(dir1, dir2):
-            return cmp(dir1.name, dir2.name)
-        directories.sort(sorter)
-        directories.reverse()
-    else:
-        directories.sort(key=operator.attrgetter('name'), reverse=True)
+    directories.sort(key=operator.attrgetter('name'), reverse=True)
 
     # Set correct owner, mtime and filemode on directories.
     for tarinfo in directories: