MQWXP_* (Cluster workload exit parameter structure)

See:

MQWXP_STRUC_ID "WXPb"
MQWXP_STRUC_ID_ARRAY 'W','X','P','b'
MQWXP_VERSION_1 1 X'00000001'
MQWXP_VERSION_2 2 X'00000002'
MQWXP_VERSION_3 3 X'00000003'
MQWXP_CURRENT_VERSION 3 X'00000003'