SDL: coreaudio: Patched to compile on iOS.

SDL Commits
1 
From 62ea2968944b6eb709d0c945f21f0abb3f5bec9c Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Mon, 27 Apr 2026 10:39:06 -0400
Subject: [PATCH] coreaudio: Patched to compile on iOS.

---
 src/audio/coreaudio/SDL_coreaudio.m | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/audio/coreaudio/SDL_coreaudio.m b/src/audio/coreaudio/SDL_coreaudio.m
index 471a472c7f214..c7f6209245934 100644
--- a/src/audio/coreaudio/SDL_coreaudio.m
+++ b/src/audio/coreaudio/SDL_coreaudio.m
@@ -598,7 +598,7 @@ static void COREAUDIO_CloseDevice(SDL_AudioDevice *device)
     if (device->hidden->interruption_listener) {
         SDLInterruptionListener *listener = (SDLInterruptionListener *)CFBridgingRelease(device->hidden->interruption_listener);
         device->hidden->interruption_listener = nil;
-        [center removeObserver:listener];
+        [[NSNotificationCenter defaultCenter] removeObserver:listener];
         @synchronized(listener) {
             listener.device = NULL;
         }
@@ -977,6 +977,7 @@ static bool COREAUDIO_OpenDevice(SDL_AudioDevice *device)
     }
 
 #ifndef MACOSX_COREAUDIO
+    NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
     SDLInterruptionListener *listener = [SDLInterruptionListener new];
     listener.device = device;