attr crashes with simgrid, and we don't need to test it there anyway

mpi/tests/Makefile.am

@@ -104,7 +104,6 @@ if BUILD_TESTS
 starpu_mpi_TESTS =
 
 starpu_mpi_TESTS +=				\
-	attr					\
 	cache					\
 	cache_disable				\
 	callback				\
@@ -132,6 +131,7 @@ starpu_mpi_TESTS +=				\
 
 if !STARPU_SIMGRID
 starpu_mpi_TESTS +=				\
+	attr					\
 	pingpong				\
 	mpi_test				\
 	mpi_isend				\