Deletes a Resource Manager instance (RMI) from the calling
    process.

    Format

      SYS$FORGET_RM  [efn] ,[flags] ,iosb ,[astadr] ,[astprm] ,rm_id

    C Prototype

      int sys$forget_rm  (unsigned int efn, unsigned int

                         flags, struct _iosb *iosb, void

                         (*astadr)(__unknown_params), int astprm,

                         unsigned int rm_id);