{
{   The purpose of this request is to obtain the file pathname of the job class
{ prolog for the caller job.
{
{       JMP$GET_JOB_CLASS_PROLOG (JOB_CLASS_PROLOG, STATUS);
{
{ JOB_CLASS_PROLOG: (outut)  This parameter specifies the file pathname of the
{       job class prolog for the caller job.  No job class prolog is
{       represented by the empty string, ''.
{
{ STATUS: (output)  This parameter specifies the request status.
{       CONDITIONS:
{             jme$job_class_not_defined
{       IDENTIFIER: 'JM'
{
