Change the name of the BTREE_IDXDELETE flag to BTREE_AUXDELETE, to better
reflect its purpose.

FossilOrigin-Name: 1d3bf6bebdda9f96734bc139601e9b05344ea0b4
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 9aeffe2..364b7a3 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -2862,7 +2862,7 @@
 #define OPFLAG_P2ISREG       0x10    /* P2 to OP_Open** is a register number */
 #define OPFLAG_PERMUTE       0x01    /* OP_Compare: use the permutation */
 #define OPFLAG_SAVEPOSITION  0x02    /* OP_Delete: keep cursor position */
-#define OPFLAG_IDXDELETE     0x04    /* OP_Delete: index in a DELETE op */
+#define OPFLAG_AUXDELETE     0x04    /* OP_Delete: index in a DELETE op */
 
 /*
  * Each trigger present in the database schema is stored as an instance of