Use spin-lock in DequeueSerial.

A thread freezed during crash processing may hold the lock and never
release it. The old behavior would cause deadlock in such situation. The
new one can be modified to work. Also, we don't want to use timed mutex.

client/TracyProfiler.cpp

@@ -1129,8 +1129,9 @@ Profiler::DequeueStatus Profiler::Dequeue( moodycamel::ConsumerToken& token )
 Profiler::DequeueStatus Profiler::DequeueSerial()
 {
     {
-        std::lock_guard<TracyMutex> lock( m_serialLock );
+        while( !m_serialLock.try_lock() ) {}
         m_serialQueue.swap( m_serialDequeue );
+        m_serialLock.unlock();
     }
 
     const auto sz = m_serialDequeue.size();