Support Deno

[ascorbic]

Thanks for your work on this! It would be great if there could be a build for Deno. I managed to get it working using the worker build, via esm.sh, with a few tweaks, but ti would be great to have one that has native support. Emscripten is capable of building for Deno: emscripten-core/emscripten#13190 (comment). I would also add DYNAMIC_EXECUTION=0, because Deno Deploy doesn't support eval().