bpo-23395: Fix PyErr_SetInterrupt if the SIGINT signal is ignored or not handled (GH-7778)

``_thread.interrupt_main()`` now avoids setting the Python error status if the ``SIGINT`` signal is ignored or not handled by Python.
diff --git a/Misc/ACKS b/Misc/ACKS
index fbed146..5c23df8 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -261,7 +261,7 @@
 Charles Cazabon
 Jesús Cea Avión
 Per Cederqvist
-Matej Cepl
+Matěj Cepl
 Carl Cerecke
 Octavian Cerna
 Michael Cetrulo