branches/zip: Resolve an error number collision in db0err.h.

The code for DB_CANNOT_DROP_FOREIGN_INDEX should have been
renumbered in r1494 (Merge revisions 1402:1493 from trunk).

include/db0err.h

@@ -62,14 +62,13 @@ Created 5/24/1996 Heikki Tuuri
 					activated by the operation would
 					lead to a duplicate key in some
 					table */
-#define	DB_CANNOT_DROP_FOREIGN_INDEX 47 /* we cannot drop an index because
-					it is needed on foreign key 
-					constraint */
-
 #define DB_TOO_MANY_CONCURRENT_TRXS 47	/* when InnoDB runs out of the
 					preconfigured undo slots, this can
 					only happen when there are too many
 					concurrent transactions */
+#define	DB_CANNOT_DROP_FOREIGN_INDEX 48 /* we cannot drop an index because
+					it is needed on foreign key
+					constraint */
 
 /* The following are partial failure codes */
 #define DB_FAIL			1000