SDL_mixer: update vendored wavpack. (36450)

From 3645028585d5eafcf834a02faabd63cbf4e0b82f Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Thu, 12 Oct 2023 23:40:32 +0300
Subject: [PATCH] update vendored wavpack.

---
 external/wavpack | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/external/wavpack b/external/wavpack
index 11a91b56..9020a678 160000
--- a/external/wavpack
+++ b/external/wavpack
@@ -1 +1 @@
-Subproject commit 11a91b5622dab59ba5ce2f9aded90d5b4a9dc299
+Subproject commit 9020a678d610aa7b099aa728ff4a33294f1ff659