Disable LU MPI simgrid test

We do not include performance models for them

mpi/examples/Makefile.am

@@ -140,9 +140,11 @@ examplebin_PROGRAMS += 			\
 	mpi_lu/plu_outofcore_example_float	\
 	mpi_lu/plu_outofcore_example_double
 
+if !STARPU_SIMGRID
 starpu_mpi_EXAMPLES	+=	\
 	mpi_lu/plu_implicit_example_float	\
 	mpi_lu/plu_implicit_example_double
+endif
 
 mpi_lu_plu_example_float_LDADD =	\
 	$(STARPU_LIBNUMA_LDFLAGS)				\