Update EMSDK to 5.0.0 (#479)

Emscripten 4.0.12 introduced breaking change by changing module factory
to always return promise even if `WASM_ASYNC_COMPILATION=0`. To overcome this, build emscripten compiler without MODULARIZE with custom export of `createRevive`.

js/emscripten/embed/extern-post.js

@@ -0,0 +1,6 @@
+return Module;
+}
+if (typeof module === "object" && typeof module.exports === "object") {
+  module.exports = createRevive;
+} else if (typeof define === "function" && define["amd"])
+  define([], () => createRevive);

js/emscripten/embed/extern-pre.js

@@ -0,0 +1,2 @@
+function createRevive(moduleArg) {
+var Module = moduleArg || {};

js/emscripten/examples/node/revive.js

@@ -1,7 +1,7 @@
 const soljson = require("solc/soljson");
 const createRevive = require("./resolc.js");
 
-async function compile(standardJsonInput) {
+function compile(standardJsonInput) {
   if (!standardJsonInput) {
     throw new Error("Input JSON for the Solidity compiler is required.");
   }

js/emscripten/examples/web/worker.js

@@ -1,7 +1,7 @@
 importScripts("./resolc_web.js");
 
 // Handle messages from the main thread
-onmessage = async function (e) {
+onmessage = function (e) {
   const m = createRevive();
 
   // Set input data for stdin