Remove sl_retFar2

In System39.exe `%0` drops stack frames for label calls (Rance4 v2
relies on this behavior), so it's the same as `UD 1`.

src/cmdu.c

@@ -55,7 +55,7 @@ void commandUD() {
 	case 0:
 		sl_reinit(); break;
 	case 1:
-		sl_retFar2(); break;
+		sl_retFar(); break;
 	default:
 		WARNING("UnKnown UD command %d", mode);
 	}

src/scenario.c

@@ -269,32 +269,6 @@ void sl_retFar(void) {
 	int *tmp = sl_pop();
 	int page, index;
 
-	while (*tmp != STACK_FARJMP) {
-		if (*tmp == STACK_NEARJMP) {
-			WARNING("Stack buffer is illegal");
-		} else if (*tmp == STACK_TXXSTATE) {
-			popState(tmp);
-		} else if (*tmp == STACK_VARIABLE) {
-			popVars(tmp);
-		} else {
-			SYSERROR("Stack buffer is illegal");
-		}
-		free(tmp);
-		tmp = sl_pop();
-	}
-	page  = *(tmp + 2);
-	index = *(tmp + 3);
-	free(tmp);
-	sl_jmpFar2(page, index);
-	
-	pageCallCnt--;
-}
-
-/* UD 1 */
-void sl_retFar2(void) {
-	int *tmp = sl_pop();
-	int page, index;
-
 	while (*tmp != STACK_FARJMP) {
 		if (*tmp == STACK_NEARJMP) {
 			labelCallCnt--;

src/scenario.h

@@ -68,7 +68,6 @@ void sl_retNear(void);
 void sl_callFar(int page);
 void sl_callFar2(int page, int address);
 void sl_retFar(void);
-void sl_retFar2(void);
 void sl_clearStack(bool restore);
 void sl_dropLabelCalls(int cnt);
 void sl_dropPageCalls(int cnt);