Add SQLITE_DBCONFIG_REVERSE_SCANORDER for direct C-language access to the

"PRAGMA reverse_unordered_selects" setting.

FossilOrigin-Name: 83e84531b46814aea6dad1ce8283cb9f6b90ad52badb60b875ea8f66e4ac0925

src/main.c

@@ -971,6 +971,7 @@ int sqlite3_db_config(sqlite3 *db, int op, ...){
         { SQLITE_DBCONFIG_LEGACY_FILE_FORMAT,    SQLITE_LegacyFileFmt  },
         { SQLITE_DBCONFIG_TRUSTED_SCHEMA,        SQLITE_TrustedSchema  },
         { SQLITE_DBCONFIG_STMT_SCANSTATUS,       SQLITE_StmtScanStatus },
+        { SQLITE_DBCONFIG_REVERSE_SCANORDER,     SQLITE_ReverseOrder   },
       };
       unsigned int i;
       rc = SQLITE_ERROR; /* IMP: R-42790-23372 */