bug(next): next@10.1.3 webpack hook issues

It looks like a monkey-patch for node internals for webpack to decide between 4 and 5 around this code: https://www.runpkg.com/?next@10.1.3/dist/next-server/server/config.js#397 (after prettifying)

```
await (0, _configUtils.loadWebpackHook)(phase, dir);
```

produces this error because of missing files, where awkwardly it looks like we have to include webpack even though we don't want to use it at runtime:

```
"Error: Cannot find module 'next/dist/compiled/webpack/webpack-lib'",
"Require stack:",
"- /var/task/node_modules/next/dist/build/webpack/require-hook.js",
"- /var/task/node_modules/next/dist/next-server/server/config-utils.js",
"- /var/task/node_modules/next/dist/next-server/server/config.js",
"- /var/task/node_modules/next/dist/next-server/server/next-server.js",
"- /var/task/node_modules/next/dist/server/next.js",
"- /var/task/server/index.js",
"- /var/runtime/UserFunction.js",
"- /var/runtime/index.js",
" at Function.Module._resolveFilename (internal/modules/cjs/loader.js:815:15)",
" at Function.resolve (internal/modules/cjs/helpers.js:80:19)",
" at /var/task/node_modules/next/dist/build/webpack/require-hook.js:4:1520",
" at Array.map ()",
" at Object. (/var/task/node_modules/next/dist/build/webpack/require-hook.js:4:1474)",
" at Module._compile (internal/modules/cjs/loader.js:999:30)",
" at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10)",
" at Module.load (internal/modules/cjs/loader.js:863:32)",
" at Function.Module._load (internal/modules/cjs/loader.js:708:14)",
" at Module.require (internal/modules/cjs/loader.js:887:19)"
```

We could just trace and package those files, but it would be nice to not bloat the package.

We've bandaided this with a tracing configuration like this: https://github.com/FormidableLabs/nextjs-serverless-demo/commit/afc7d2ecf2f2f10e870bed8df2297bc07994f2f2#diff-8cf16232f3b7094ea431234555d38ad71e6e62764c3e29a5841e25172aea5049R127-R130

Task:

- [ ] Figure out if we can avoid this...