SDL_mixer: update vendored libgme (2188f)

From 2188fe7d4c97f8efce09189590ae4ec948fbab74 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Tue, 23 Apr 2024 08:50:04 +0300
Subject: [PATCH] update vendored libgme

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

diff --git a/external/libgme b/external/libgme
index cdd02150..cc559887 160000
--- a/external/libgme
+++ b/external/libgme
@@ -1 +1 @@
-Subproject commit cdd021507518162a4884898bbac85cbd32ed7a77
+Subproject commit cc559887fcec0bcb7ad0fffde07cd5274caa8b08