mpi: Re-enable plu_example_*

They are now working again

mpi/examples/Makefile.am

@@ -159,6 +159,8 @@ examplebin_PROGRAMS += 			\
 
 if !STARPU_SIMGRID
 starpu_mpi_EXAMPLES	+=	\
+	mpi_lu/plu_example_float	\
+	mpi_lu/plu_example_double	\
 	mpi_lu/plu_implicit_example_float	\
 	mpi_lu/plu_implicit_example_double	\
 	mpi_lu/plu_outofcore_example_float	\