(svn r10444) -Codechange: switch to c++ classes and inheritance for sound/music/video drivers, using self-registration based on the blitter-model.

src/sound/null_s.cpp

@@ -3,10 +3,4 @@
 #include "../stdafx.h"
 #include "null_s.h"
 
-static const char *NullSoundStart(const char * const *parm) { return NULL; }
-static void NullSoundStop() {}
-
-const HalSoundDriver _null_sound_driver = {
-	NullSoundStart,
-	NullSoundStop,
-};
+static FSoundDriver_Null iFSoundDriver_Null;