File add_missing_iostream_include.patch of Package octave-forge-database

--- a/src/error-helpers.cc	2019-03-05 14:28:24.967487038 +0100
+++ b/src/error-helpers.cc	2019-03-05 14:40:09.977597631 +0100
@@ -19,6 +19,8 @@
 
 #include <octave/oct.h>
 
+#include <iostream>
+
 #include "error-helpers.h"
 
 // call verror