Fix scope issue when setting thread names in the multi-threaded signature checker #1674
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There are some intermittent test failures (I could only reproduce them on a MAC), caused by a SIGABRT in the ~std::unique_ptr destructor. It seems that the mutex is going out of scope before the thread pool has fully finished. When the last promise.set_value () is called it notifies the main thread that the thread work is finished, and then exits the function (set_thread_names), but the threads haven't fully finished (i.e they still need to call destructors). I'm now (re)using the class member mutex so that it stays in the scope during this cleanup.