Remove obsolete 'rU' mode in Tools/scripts too (see be5b8d1ded34)
diff --git a/Tools/scripts/pysource.py b/Tools/scripts/pysource.py
index 048131e..c7dbe60 100644
--- a/Tools/scripts/pysource.py
+++ b/Tools/scripts/pysource.py
@@ -42,7 +42,7 @@
         return None
 
     try:
-        return open(fullpath, 'rU')
+        return open(fullpath)
     except IOError as err: # Access denied, or a special file - ignore it
         print_debug("%s: access denied: %s" % (fullpath, err))
         return None