Issue #17117: Have both import itself and importlib.util.set_loader()
set __loader__ on a module when set to None.

Thanks to Gökcen Eraslan for the fix.
diff --git a/Misc/ACKS b/Misc/ACKS
index 78c62ee..8758297 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -339,6 +339,7 @@
 Jeff Epler
 Jeff McNeil
 Tom Epperly
+Gökcen Eraslan
 Stoffel Erasmus
 Jürgen A. Erhard
 Michael Ernst