When vacuuming an index that uses no collations other than BINARY, assume that the order of index entries will not be changed by the VACUUM.

FossilOrigin-Name: e403460b96814ac8cb976d58b27939b3bd3c61f9
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 9df6d1b..5e49bf5 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -1226,6 +1226,7 @@
 #define SQLITE_DeferFKs       0x01000000  /* Defer all FK constraints */
 #define SQLITE_QueryOnly      0x02000000  /* Disable database changes */
 #define SQLITE_VdbeEQP        0x04000000  /* Debug EXPLAIN QUERY PLAN */
+#define SQLITE_Vacuum         0x08000000  /* Currently in a VACUUM */
 
 
 /*