SDL_mixer: update vendored libgme.

From d2047c2d8bc28a57b8016e5048ebe4c6ba950a11 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Tue, 24 Oct 2023 11:30:24 +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 4bea983c..74b31d68 160000
--- a/external/libgme
+++ b/external/libgme
@@ -1 +1 @@
-Subproject commit 4bea983cfd06205a482b028c77291b2a51cfaddb
+Subproject commit 74b31d683a8fb0f800de4d04136ced1d3707a841