Issue #15424: Add a __sizeof__ implementation for array objects.

Patch by Ludwig Hähne.
diff --git a/Misc/ACKS b/Misc/ACKS
index 4d8f13c..36dc7fe 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -434,6 +434,7 @@
 Greg Humphreys
 Eric Huss
 Jeremy Hylton
+Ludwig Hähne
 Gerhard Häring
 Fredrik Håård
 Mihai Ibanescu