Make _NARG work

src/asm/symbol.c

@@ -848,6 +848,10 @@ sym_PrepPass2(void)
 	sym_AddString("__TIME__", SavedTIME);
 	sym_AddString("__DATE__", SavedDATE);
 	sym_AddSet("_RS", 0);
+
+	sym_AddEqu("_NARG", 0);
+	p_NARGSymbol = findsymbol("_NARG", NULL);
+	p_NARGSymbol->Callback = Callback_NARG;
 }
 /*
  * RGBAsm - SYMBOL.C - Symboltable stuff