util: Use timespec_get directly, it's always present

Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15497>

src/util/u_queue.c

@@ -183,11 +183,7 @@ _util_queue_fence_wait_timeout(struct util_queue_fence *fence,
    if (rel > 0) {
       struct timespec ts;
 
-#if defined(HAVE_TIMESPEC_GET) || defined(_WIN32)
       timespec_get(&ts, TIME_UTC);
-#else
-      clock_gettime(CLOCK_REALTIME, &ts);
-#endif
 
       ts.tv_sec += abs_timeout / (1000*1000*1000);
       ts.tv_nsec += abs_timeout % (1000*1000*1000);