update of old PL/SQL PLpgSQL and SQLPL patch based on current version

see [linguist] add support for oracle PLSQL (#1003)

samples/SQLPL/drop_table.db2

@@ -0,0 +1,13 @@
+DROP TABLE TDEPT;
+CREATE TABLE TDEPT (DEPTNO CHAR(4));
+
+--#SET TERMINATOR @
+BEGIN ATOMIC
+  DECLARE COUNT INT DEFAULT 5;
+
+  WHILE COUNT > 0 DO
+    INSERT INTO TDEPT VALUES 'F'||
+       RTRIM(CHAR(COUNT));
+    SET COUNT = COUNT - 1;
+  END WHILE;
+END@