Do not show Cholesky test output by default, it affects make check

examples/cholesky/cholesky.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 # StarPU --- Runtime system for heterogeneous multicore architectures.
 #
-# Copyright (C) 2018                                     Université de Bordeaux
+# Copyright (C) 2018-2019                                Université de Bordeaux
 #
 # StarPU is free software; you can redistribute it and/or modify
 # it under the terms of the GNU Lesser General Public License as published by
@@ -61,5 +61,5 @@ do
 	COMMA=", "
 done
 gnuplot cholesky.gp
-gv $OUTFILE
+#gv $OUTFILE
 true