Replace Math.random with crypto.getRandomValues for _system_number

vendor/wasm/js/runtime.js

@@ -1350,7 +1350,6 @@ function odinSetupDefaultImports(wasmMemoryInterface, consoleElement) {
 			exp:     Math.exp,
 			ldexp:   (x, exp) => x * Math.pow(2, exp),
 
-			rand: Math.random,
 			rand_bytes: (ptr, len) => {
 				const view = new Uint8Array(wasmMemoryInterface.memory.buffer, ptr, len)
 				crypto.getRandomValues(view)