Issue #14605 and #14642:
Issue a warning in case Python\importlib.h needs to be rebuilt,
but there's no Python interpreter around to freeze the bootstrap
script.
diff --git a/Python/importlib.h b/Python/importlib.h
index 8bc0d81..9dbd881 100644
--- a/Python/importlib.h
+++ b/Python/importlib.h
Binary files differ