Issue #3732: Backported r53335 to supress deprecation warning.

Reviewed by Benjamin Peterson.

Lib/msilib/__init__.py

@@ -2,7 +2,7 @@
 # Copyright (C) 2005 Martin v. Lwis
 # Licensed to PSF under a Contributor Agreement.
 from _msi import *
-import sets, os, string, re
+import os, string, re
 
 Win64=0
 
@@ -184,7 +184,7 @@ class CAB:
     def __init__(self, name):
         self.name = name
         self.files = []
-        self.filenames = sets.Set()
+        self.filenames = set()
         self.index = 0
 
     def gen_id(self, file):
@@ -215,7 +215,7 @@ class CAB:
         os.unlink(filename)
         db.Commit()
 
-_directories = sets.Set()
+_directories = set()
 class Directory:
     def __init__(self, db, cab, basedir, physical, _logical, default, componentflags=None):
         """Create a new directory in the Directory table. There is a current component
@@ -239,8 +239,8 @@ class Directory:
         self.physical = physical
         self.logical = logical
         self.component = None
-        self.short_names = sets.Set()
-        self.ids = sets.Set()
+        self.short_names = set()
+        self.ids = set()
         self.keyfiles = {}
         self.componentflags = componentflags
         if basedir: