SDL_mixer: external libs, libmodplug: fixed an -Wlto-type-mismatch warning.

SDL Commits
1 
From 5569e3de4bfe1a4044e08056d2d1a083cf1793b6 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Sun, 12 Dec 2021 23:55:10 +0300
Subject: [PATCH] external libs, libmodplug: fixed an -Wlto-type-mismatch
 warning.

---
 external/libmodplug-0.8.9.0/src/snd_dsp.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/external/libmodplug-0.8.9.0/src/snd_dsp.cpp b/external/libmodplug-0.8.9.0/src/snd_dsp.cpp
index ab5a3058..3a2969d4 100644
--- a/external/libmodplug-0.8.9.0/src/snd_dsp.cpp
+++ b/external/libmodplug-0.8.9.0/src/snd_dsp.cpp
@@ -99,7 +99,7 @@ static LONG DolbyHiFilterBuffer[FILTERBUFFERSIZE];
 static LONG SurroundBuffer[SURROUNDBUFFERSIZE];
 
 // Access the main temporary mix buffer directly: avoids an extra pointer
-extern int MixSoundBuffer[MIXBUFFERSIZE*2];
+extern int MixSoundBuffer[MIXBUFFERSIZE*4];
 //cextern int MixReverbBuffer[MIXBUFFERSIZE*2];
 extern int MixReverbBuffer[MIXBUFFERSIZE*2];