Fix 5.1 channel mapping on Steam Link

app/streaming/audio/renderers/renderer.h

@@ -15,4 +15,14 @@ public:
     virtual bool submitAudio(int bytesWritten) = 0;
 
     virtual int getCapabilities() = 0;
+
+    virtual void remapChannels(POPUS_MULTISTREAM_CONFIGURATION) {
+        // Use default channel mapping:
+        // 0 - Front Left
+        // 1 - Front Right
+        // 2 - Center
+        // 3 - LFE
+        // 4 - Surround Left
+        // 5 - Surround Right
+    }
 };