bug: crash from readerwriterqueue.h

[dromer]

I was playing around with https://github.com/unfamiliartunes/spectralsand/ and can very easily get plugdata to crash with this message:

plugdata: /home/dreamer/Sources/_audio/_plugins/plugdata/Libraries/readerwriterqueue/readerwriterqueue.h:681: moodycamel::ReaderWriterQueue<T, MAX_BLOCK_SIZE>::ReentrantGuard::ReentrantGuard(moodycamel::weak_atomic<bool>&) [with T = pd::MessageDispatcher::Message; long unsigned int MAX_BLOCK_SIZE = 512]: Assertion `!inSection && "Concurrent (or re-entrant) enqueue or dequeue operation detected (only one thread at a time may hold the producer or consumer role)"' failed.
Aborted