MorphOS compatibility (REQ #4)

src/system/program_amiga.cpp

@@ -73,10 +73,10 @@ static struct IntuitionBase *IntuitionBase = nullptr;
 
 #define ARGS_FORMAT "SHELL/S,NOANSI/S,AREXX/S,INPUT/F"
 
-#if defined(AOS3)
-#define RDPTR LONG *
-#else
+#if defined(AROS)
 #define RDPTR IPTR *
+#else
+#define RDPTR LONG *
 #endif
 
 AmigaProgram::AmigaProgram()