Add empty placeholders to fix HIO funcs missing when linking debug version

src/d/actor/d_a_kamome.cpp

@@ -28,7 +28,7 @@ public:
     }
     virtual ~kamomeHIO_c() {}
 
-    void genMessage(JORMContext*);
+    void genMessage(JORMContext* ctx) {}
 
 public:
     /* 0x04 */ s8 mNo;