Make compiling D-Star conditional.

DStarHeader.h

@@ -1,5 +1,5 @@
 /*
-*   Copyright (C) 2016 by Jonathan Naylor G4KLX
+*   Copyright (C) 2016,2023 by Jonathan Naylor G4KLX
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
@@ -19,6 +19,10 @@
 #ifndef	DStarHeader_H
 #define	DStarHeader_H
 
+#include "Defines.h"
+
+#if defined(USE_DSTAR)
+
 class CDStarHeader {
 public:
 	CDStarHeader(const unsigned char* header);
@@ -56,3 +60,6 @@ private:
 };
 
 #endif
+
+#endif
+