Bug#28223: mysqldump --compact --routines restores from @OLD_SQL_MODE w/o ever setting it

mysqldump generated output that set OLD_SQL_MODE twice, to different values
(for triggers), or not at all (for routines) in some cases.
---
Merge blasphemy.mysql.com:/home/tnurnberg/28223/50-28223
into  blasphemy.mysql.com:/home/tnurnberg/28223/51-28223

client/mysqldump.c

@@ -1608,6 +1608,9 @@ static uint dump_routines_for_db(char *db)
   if (lock_tables)
     mysql_query(mysql, "LOCK TABLES mysql.proc READ");
 
+  if (opt_compact)
+    fprintf(sql_file, "\n/*!50003 SET @OLD_SQL_MODE=@@SQL_MODE*/;\n");
+
   fprintf(sql_file, "DELIMITER ;;\n");
 
   /* 0, retrieve and dump functions, 1, procedures */
@@ -2264,8 +2267,11 @@ static void dump_triggers_for_table(char *table,
     DBUG_VOID_RETURN;
   }
   if (mysql_num_rows(result))
-    fprintf(sql_file, "\n/*!50003 SET @OLD_SQL_MODE=@@SQL_MODE*/;\n\
-DELIMITER ;;\n");
+  {
+    if (opt_compact)
+      fprintf(sql_file, "\n/*!50003 SET @OLD_SQL_MODE=@@SQL_MODE*/;\n");
+    fprintf(sql_file, "\nDELIMITER ;;\n");
+  }
   while ((row= mysql_fetch_row(result)))
   {
     fprintf(sql_file,

mysql-test/r/mysqldump.result

@@ -2242,7 +2242,6 @@ INSERT INTO `t1` VALUES (1,NULL),(2,NULL),(4,NULL),(11,NULL);
 /*!40000 ALTER TABLE `t1` ENABLE KEYS */;
 UNLOCK TABLES;
 
-/*!50003 SET @OLD_SQL_MODE=@@SQL_MODE*/;
 DELIMITER ;;
 /*!50003 SET SESSION SQL_MODE="" */;;
 /*!50003 CREATE */ /*!50017 DEFINER=`root`@`localhost` */ /*!50003 TRIGGER `trg1` BEFORE INSERT ON `t1` FOR EACH ROW begin
@@ -2276,7 +2275,6 @@ LOCK TABLES `t2` WRITE;
 /*!40000 ALTER TABLE `t2` ENABLE KEYS */;
 UNLOCK TABLES;
 
-/*!50003 SET @OLD_SQL_MODE=@@SQL_MODE*/;
 DELIMITER ;;
 /*!50003 SET SESSION SQL_MODE="STRICT_TRANS_TABLES,STRICT_ALL_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,TRADITIONAL,NO_AUTO_CREATE_USER" */;;
 /*!50003 CREATE */ /*!50017 DEFINER=`root`@`localhost` */ /*!50003 TRIGGER `trg4` BEFORE INSERT ON `t2` FOR EACH ROW begin
@@ -2634,7 +2632,6 @@ INSERT INTO "t1 test" VALUES (1),(2),(3);
 /*!40000 ALTER TABLE "t1 test" ENABLE KEYS */;
 UNLOCK TABLES;
 
-/*!50003 SET @OLD_SQL_MODE=@@SQL_MODE*/;
 DELIMITER ;;
 /*!50003 SET SESSION SQL_MODE="" */;;
 /*!50003 CREATE */ /*!50017 DEFINER=`root`@`localhost` */ /*!50003 TRIGGER `test trig` BEFORE INSERT ON `t1 test` FOR EACH ROW BEGIN
@@ -2795,7 +2792,6 @@ LOCK TABLES `t1` WRITE;
 /*!40000 ALTER TABLE `t1` ENABLE KEYS */;
 UNLOCK TABLES;
 
-/*!50003 SET @OLD_SQL_MODE=@@SQL_MODE*/;
 DELIMITER ;;
 /*!50003 SET SESSION SQL_MODE="IGNORE_SPACE" */;;
 /*!50003 CREATE */ /*!50017 DEFINER=`root`@`localhost` */ /*!50003 TRIGGER `tr1` BEFORE INSERT ON `t1` FOR EACH ROW BEGIN
@@ -3292,12 +3288,16 @@ create database mysqldump_test_db;
 grant all privileges on mysqldump_test_db.*  to user1;
 grant all privileges on mysqldump_test_db.*  to user2;
 create procedure mysqldump_test_db.sp1() select 'hello';
+
+/*!50003 SET @OLD_SQL_MODE=@@SQL_MODE*/;
 DELIMITER ;;
 
 -- insufficient privileges to SHOW CREATE PROCEDURE `sp1`
 -- does user2 have permissions on mysql.proc?
 
 DELIMITER ;
+
+/*!50003 SET @OLD_SQL_MODE=@@SQL_MODE*/;
 DELIMITER ;;
 /*!50003 SET SESSION SQL_MODE=""*/;;
 /*!50003 CREATE*/ /*!50020 DEFINER=`user1`@`%`*/ /*!50003 PROCEDURE `sp1`()