Fixed import of configparser in the distutils module.

If configparser is unavailable, try to import configparser using its
old name. This is required for backward-compatibility with older
Python versions.
diff --git a/Lib/distutils/dist.py b/Lib/distutils/dist.py
index 0b13c1e..6299919 100644
--- a/Lib/distutils/dist.py
+++ b/Lib/distutils/dist.py
@@ -358,8 +358,11 @@
 
 
     def parse_config_files (self, filenames=None):
-
-        from ConfigParser import ConfigParser
+        try:
+            from configparser import ConfigParser
+        except ImportError:
+            # For backward-compatibility with Python versions < 2.6.
+            from ConfigParser import ConfigParser
 
         if filenames is None:
             filenames = self.find_config_files()