add missing result file

storage/spider/mysql-test/spider/bugfix/r/mdev_28739_simple.result

+#
+# MDEV-28739 Trying to lock uninitialized mutex or hang upon shutdown after using Spider with query_cache
+#
+for master_1
+for child2
+for child3
+set global query_cache_type= on;
+CREATE SERVER srv FOREIGN DATA WRAPPER mysql
+OPTIONS (SOCKET "$MASTER_1_MYSOCK", DATABASE 'test',user 'root');
+create table t2 (c int);
+create table t1 (c int) ENGINE=Spider
+COMMENT='WRAPPER "mysql", srv "srv",TABLE "t2"';
+SELECT * FROM t1;
+c
+# restart
+drop table t1, t2;
+drop server srv;
+for master_1
+for child2
+for child3