Problem was an unclear error message since it could suggest that
MyISAM did not support INSERT DELAYED.
Changed the error message to say that DELAYED is not supported by the
table, instead of the table's storage engine.
The confusion is that a partitioned table is in somewhat sense using
the partitioning storage engine, which in turn uses the ordinary
storage engine. By saying that the table does not support DELAYED we
do not give any extra informantion about the storage engine or if it
is partitioned.

mysql-test/r/innodb-replace.result:
  Bug#31210: INSERT DELAYED crashes server when used on partitioned tables
  
  changed error message
mysql-test/t/innodb-replace.test:
  Bug#31210: INSERT DELAYED crashes server when used on partitioned tables
  
  changed error message
mysql-test/t/merge.test:
  Bug#31210: INSERT DELAYED crashes server when used on partitioned tables
  
  changed error message
mysql-test/t/partition_hash.test:
  Bug#31210: INSERT DELAYED crashes server when used on partitioned tables
  
  changed error message
sql/share/errmsg.txt:
  Bug#31210: INSERT DELAYED crashes server when used on partitioned tables
  
  added error message for tables not supporting DELAYED
sql/sql_insert.cc:
  Bug#31210: INSERT DELAYED crashes server when used on partitioned tables
  
  changed error message