SDL_mixer: cmake/test/main.c: Updated for new SDL3_mixer API.

SDL Commits
1 
From 7dddbed53f2d2ac2b9cbada9c74a2b67bd8b6fb5 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Thu, 24 Jul 2025 00:30:13 -0400
Subject: [PATCH] cmake/test/main.c: Updated for new SDL3_mixer API.

---
 cmake/test/main.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/cmake/test/main.c b/cmake/test/main.c
index 0dc5cc62e..a6af959ce 100644
--- a/cmake/test/main.c
+++ b/cmake/test/main.c
@@ -8,10 +8,10 @@ int main(int argc, char *argv[])
         SDL_Log("SDL_Init: could not initialize SDL: %s\n", SDL_GetError());
         return 1;
     }
-    if (Mix_Init(0) == 0) {
-        SDL_Log("Mix_Init: no sound/music loaders supported (%s)\n", SDL_GetError());
+    if (MIX_Init() == 0) {
+        SDL_Log("MIX_Init: no sound/music loaders supported (%s)\n", SDL_GetError());
     }
-    Mix_Quit();
+    MIX_Quit();
     SDL_Quit();
     return 0;
 }