Remove the only use of a string method.
Fixes SF 564840.
diff --git a/Tools/freeze/modulefinder.py b/Tools/freeze/modulefinder.py
index 924c3a4..741ef4d 100644
--- a/Tools/freeze/modulefinder.py
+++ b/Tools/freeze/modulefinder.py
@@ -357,7 +357,7 @@
 
     def find_module(self, name, path):
         if path:
-            fullname = '.'.join(path)+'.'+name
+            fullname = string.join(path, '.')+'.'+name
         else:
             fullname = name
         if fullname in self.excludes: