Fix SF item #876278: Unbounded recursion in modulefinder.

Already backported to release23-maint.
diff --git a/Misc/NEWS b/Misc/NEWS
index 809d2d9..f111d0e 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -306,6 +306,8 @@
 Library
 -------
 
+- Bug #876278: Unbounded recursion in modulefinder
+
 - Bug #780300: Swap public and system ID in LexicalHandler.startDTD.
   Applications relying on the wrong order need to be corrected.