SDL_mixer: update timidity.tar.gz url in README file.

From 95402d6ce6d2438cc60c4863167922c14fe0d483 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Thu, 18 Dec 2025 23:05:40 +0300
Subject: [PATCH] update timidity.tar.gz url in README file.

---
 README.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.txt b/README.txt
index 0a62a6ab8..b853164e9 100644
--- a/README.txt
+++ b/README.txt
@@ -15,7 +15,7 @@ If you have built with FluidSynth support, you'll need to set the SDL_SOUNDFONTS
 (On some Linux distributions you can install the fluid-soundfont-gm package)
 
 To play MIDI files using Timidity, you'll need to get a complete set of GUS patches from:
-http://www.libsdl.org/projects/mixer/timidity/timidity.tar.gz
+https://www.libsdl.org/projects/old/SDL_mixer/timidity/timidity.tar.gz
 and unpack them in /usr/local/lib under UNIX, and C:\ under Win32.
 
 This library is under the zlib license, see the file "LICENSE.txt" for details.