Reworked DSP serialization

src/audio_core/dsp_interface.h

@@ -6,6 +6,7 @@
 
 #include <memory>
 #include <vector>
+#include <boost/serialization/access.hpp>
 #include "audio_core/audio_types.h"
 #include "audio_core/time_stretch.h"
 #include "common/common_types.h"
@@ -113,6 +114,10 @@ private:
     Common::RingBuffer<s16, 0x2000, 2> fifo;
     std::array<s16, 2> last_frame{};
     TimeStretcher time_stretcher;
+
+    template <class Archive>
+    void serialize(Archive& ar, const unsigned int) {}
+    friend class boost::serialization::access;
 };
 
 } // namespace AudioCore