sync actual changes from newer mongodb

Index: src/mongo/db/fts/unicode/gen_diacritic_list.py
--- src/mongo/db/fts/unicode/gen_diacritic_list.py.orig
+++ src/mongo/db/fts/unicode/gen_diacritic_list.py
@@ -20,7 +20,7 @@ def generate(unicode_proplist_file, target):
 
     diacritics = set()
 
-    proplist_file = open(unicode_proplist_file, 'rU')
+    proplist_file = open(unicode_proplist_file, 'r')
 
     for line in proplist_file:
         # Filter out blank lines and lines that start with #
