Fix: on startup, NewGRF scan could case race-condition (#9382)
Creating a thread was not thread-safe. The irony. The video-driver has a function GameLoopPause() which first checks if the thread is the game-thread or not. For this it needs access to this->game_thread. This variable is set in StartNewThread(). However, due to timing, it is well possible GameLoopPause() is called from the thread well before this->game_thread is assigned. And so we have a race-condition! Simply solve this by preventing a thread to start till we are done with our bookkeeping.pull/332/head
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