build: Bundle polyfills for Node.js in version-specific packages

`dist/esm/browser.js` in `@ruby/wasm-wasi` no longer contains polyfills
for Node.js, so we need to bundle them in the version-specific packages.

Author: kateinoigakukun

packages/npm-packages/ruby-3.2-wasm-wasi/rollup.config.mjs

@@ -0,0 +1 @@
+../ruby-head-wasm-wasi/rollup.config.mjs

packages/npm-packages/ruby-3.2-wasm-wasi/rollup.config.mjs

@@ -1,5 +1,7 @@
 import json from "@rollup/plugin-json";
+import inject from "@rollup/plugin-inject";
 import { nodeResolve } from "@rollup/plugin-node-resolve";
+import nodePolyfills from "rollup-plugin-polyfill-node";
 import fs from "fs";
 import path from "path";
 
@@ -14,6 +16,10 @@ export default [
         banner: "/* " + fs.readFileSync(path.resolve("../../../NOTICE"), "utf8") + "*/",
       }
     ],
-    plugins: [json(), nodeResolve()],
+    plugins: [
+      nodePolyfills(),
+      inject({ Buffer: ["buffer", "Buffer"] }),
+      json(), nodeResolve()
+    ],
   },
 ];