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b2a4a05683
This switches skwasm over from the emscripten pthreads implementation to emscripten's "wasm workers" threading implementation. The pthreads implementation simply will not run at all in a non-crossOriginIsolated context, but the wasm workers implementation only fails if we actually attempt to spawn a thread. This means we can actually choose whether to use a single-threaded or multi-threaded strategy at runtime, which means we don't have to build two variants of skwasm for single- vs multi-threaded.