Bug#55501: Disable innodb plugin usage in the embedded server on certain OSes

Do not attempt to test the innodb plugin with the embedded server,
it's not supported for now.

mysql-test/include/have_innodb_plugin.inc

+--source include/not_embedded.inc
 disable_query_log;
 --require r/true.require
 SELECT (plugin_library LIKE 'ha_innodb_plugin%') AS `TRUE` FROM information_schema.plugins WHERE LOWER(plugin_name) = 'innodb' AND LOWER(plugin_status) = 'active';