revert r20146: helper.h should not be used for examples

examples/helper.h

@@ -1,22 +0,0 @@
-/* StarPU --- Runtime system for heterogeneous multicore architectures.
- *
- * Copyright (C) 2017  Inria
- *
- * 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
- * the Free Software Foundation; either version 2.1 of the License, or (at
- * your option) any later version.
- *
- * StarPU is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- *
- * See the GNU Lesser General Public License in COPYING.LGPL for more details.
- */
-
-#ifndef _TESTS_HELPER_H
-#define _TESTS_HELPER_H
-
-#define STARPU_TEST_SKIPPED 77
-
-#endif /* _TESTS_HELPER_H */