SDL_mixer: update vendored flac (d8858)

From d88586f85b409eb661f7590b13f61e7fed2667cb Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Mon, 2 Feb 2026 03:14:24 +0300
Subject: [PATCH] update vendored flac

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

diff --git a/external/flac b/external/flac
index 86b36086..efc0d01b 160000
--- a/external/flac
+++ b/external/flac
@@ -1 +1 @@
-Subproject commit 86b360863221d0f6957e01d477710759e18ecdbf
+Subproject commit efc0d01b749789aae5072e2b8709f91e81322624