add void def fxt

mpi/src/starpu_mpi_fxt.h

@@ -182,6 +182,8 @@ extern "C"
 #define _STARPU_MPI_TRACE_POLLING_END()				do {} while(0);
 #define _STARPU_MPI_TRACE_DRIVER_RUN_BEGIN()			do {} while(0);
 #define _STARPU_MPI_TRACE_DRIVER_RUN_END()			do {} while(0);
+#define _STARPU_MPI_TRACE_CHECKPOINT_BEGIN(cp_instance, cp_domain)				do {} while(0)
+#define _STARPU_MPI_TRACE_CHECKPOINT_END(cp_instance, cp_domain)	do {} while(0)
 #endif
 
 #ifdef __cplusplus