We observe failures in CI on QNX because the measured timeout is ~995ms
rather than the expected 1000ms. Start the timer before the thread
starts to guarantee that at least as much time elapses as the thread
waits before writing the second byte to the pipe.
Otherwise, the thread might be sleeping already when the timer starts,
and then we can't rely on any measurements.
Pick-to: 6.6 6.5
Change-Id: I6072569a987f5e952b0953e0e394a223f891fd25
Reviewed-by: Dimitrios Apostolou <jimis@qt.io>
30e5ff3ff2