sync actual changes from newer mongodb

Index: src/mongo/db/fts/unicode/gen_delimiter_list.py
--- src/mongo/db/fts/unicode/gen_delimiter_list.py.orig
+++ src/mongo/db/fts/unicode/gen_delimiter_list.py
@@ -21,7 +21,7 @@ def generate(unicode_proplist_file, target):
 
     delim_codepoints = set()
 
-    proplist_file = open(unicode_proplist_file, 'rU')
+    proplist_file = open(unicode_proplist_file, 'r')
 
     delim_properties = ["White_Space",
                         "Dash",
