Issue #19201: Add support for the 'x' mode to the lzma module.

Patch by Tim Heaney and Vajrasky Kok.
diff --git a/Misc/ACKS b/Misc/ACKS
index e204bc3..880e4f0 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -506,6 +506,7 @@
 Rycharde Hawkes
 Ben Hayden
 Jochen Hayek
+Tim Heaney
 Henrik Heimbuerger
 Christian Heimes
 Thomas Heller