SDL_mixer: update vendored wavpack. (b8e55)

From b8e55ca55e496bcea0023417f1cefbfa9da303e7 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Thu, 3 Apr 2025 17:55:50 +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 f42b5ae2..1258d38a 160000
--- a/external/wavpack
+++ b/external/wavpack
@@ -1 +1 @@
-Subproject commit f42b5ae2a6bc251fe4b8729240449e7ac54ca993
+Subproject commit 1258d38a2ccbed109980a8b7da73181498a5067a