[LTP] clock_settime: use POSIX runtime detection for CLOCK_MONOTONIC

[linuxtestproject.agent@gmail.com]

Hi Andrea,

On Wed, 29 Apr 2026 10:28:35 +0200, Andrea Cervesato wrote:
> clock_settime: use POSIX runtime detection for CLOCK_MONOTONIC

> +/*
> + * Copyright (c) 2026, Linux Test Project
> + * SPDX-License-Identifier: GPL-2.0-or-later
> + */

Missing `Created by:` attribution line. Other headers in this directory
(posixtest.h, mq_send.h) carry it. Add:
  * Created by: Andrea Cervesato <andrea.cervesato@suse.com>

[...]

Pre-existing issues noticed in the surrounding code (not introduced
by this patch):

- clock_settime/4-1.c (and siblings) — uses `test_main` instead of `int main`
- clock_settime/helpers.h — `getBeforeTime()`/`setBackTime()` call perror()
  without including <stdio.h> in the header itself

---
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