Fix testsuite when no blas is available

examples/Makefile.am

@@ -153,8 +153,10 @@ TESTS			=	$(STARPU_EXAMPLES)
 if !STARPU_USE_MPI_MASTER_SLAVE
 TESTS			+=	scheduler/schedulers.sh
 TESTS			+=	scheduler/schedulers_context.sh
+if !NO_BLAS_LIB
 TESTS			+=	mult/sgemm.sh
 endif
+endif
 
 if STARPU_HAVE_WINDOWS
 check_PROGRAMS		=	$(STARPU_EXAMPLES)