APIs: change to the operation of API exits

API exits which themselves make API calls, rather than using the MQIEP structure, should be linked with an IBM® MQ API library, otherwise they will fail to load inside runmqsc.

From IBM MQ 8.0, if you want to make direct MQI calls through an API exit you need to link with something that provides them. See API exits not linked with an MQI library for more information.