Don't call setPreferredOutputNumberOfChannels on iOS, it breaks audio output

src/audio/coreaudio/SDL_coreaudio.m

@@ -855,6 +855,7 @@ COREAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
         AVAudioSession* session = [AVAudioSession sharedInstance];
         [session setPreferredSampleRate:this->spec.freq error:nil];
         this->spec.freq = (int)session.sampleRate;
+#if TARGET_OS_TV
         if (iscapture) {
             [session setPreferredInputNumberOfChannels:this->spec.channels error:nil];
             this->spec.channels = session.preferredInputNumberOfChannels;
@@ -862,6 +863,9 @@ COREAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
             [session setPreferredOutputNumberOfChannels:this->spec.channels error:nil];
             this->spec.channels = session.preferredOutputNumberOfChannels;
         }
+#else
+		/* Calling setPreferredOutputNumberOfChannels seems to break audio output on iOS */
+#endif /* TARGET_OS_TV */
     }
 #endif