Fix build without BLAS

mpi/tests/Makefile.am

@@ -235,9 +235,13 @@ noinst_PROGRAMS =				\
 	load_balancer				\
 	driver					\
 	sendrecv_bench				\
-	sendrecv_gemm_bench			\
 	sendrecv_parallel_tasks_bench
 
+if !NO_BLAS_LIB
+noinst_PROGRAMS +=				\
+	sendrecv_gemm_bench
+endif
+
 XFAIL_TESTS=					\
 	policy_register_toomany			\
 	policy_unregister			\