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This avoids a race on Windows, where attaching is non-atomic.

Task-number: QTCREATORBUG-8663
Change-Id: I119cae7129882fabaa97fa3f236379e5efe62df9
Reviewed-by: David Schulz <david.schulz@digia.com>
Reviewed-by: Christian Stenger <christian.stenger@digia.com>