flush any remaining audio samples to the output buffer on frame end

ensures that all audio for the frame is actually available for instance
in cases where audio is not running on a separate thread

Author: nadiaholmquist

src/NDS.cpp

@@ -1056,6 +1056,9 @@ u32 NDS::RunFrame()
         break;
     }
 
+    // Ensure the last audio samples produced for this frame are available to the frontend immediately
+    SPU.BufferAudio();
+
     // In the context of TASes, frame count is traditionally the primary measure of emulated time,
     // so it needs to be tracked even if NDS is powered off.
     NumFrames++;