Added link_dest_used unsigned short to struct hlink and made the

other values explicitly 32-bit so that the total size can't be
larger than the other struct we're in a union with.

rsync.h

@@ -498,8 +498,9 @@ struct idev {
 #define HL_SKIP		1
 
 struct hlink {
-	int next;
-	int hlindex;
+	int32 next;
+	int32 hlindex;
+	unsigned short link_dest_used;
 };
 
 #define F_DEV	link_u.idev->dev