convert/subversion: Use util.set() instead of set() for python2.3 compatibility

convert/subversion: Use util.set() instead of set() for python2.3 compatibility

--- a/hgext/convert/subversion.py	Fri Aug 31 12:54:07 2007 +0200
+++ b/hgext/convert/subversion.py	Fri Aug 31 13:14:03 2007 +0200
@@ -314,7 +314,7 @@
         out, e.g. 'I copied trunk into a subdirectory of itself instead
         of making a branch'. The converted repository is significantly
         smaller if we ignore such revisions."""
-        self.blacklist = set()
+        self.blacklist = util.set()
         blacklist = self.blacklist
         for line in file("blacklist.txt", "r"):
             if not line.startswith("#"):