Undici crashes on node compiled without crypto

[aduh95]

@nodejs/undici this seems to break with a container/machine without OpenSSL:
https://ci.nodejs.org/job/node-test-commit-linux-containered/33340/nodes=ubuntu1804_sharedlibs_withoutssl_x64/

17:44:45     [UNEXPECTED_FAILURE][FAIL] Importing an i32 global with an incorrectly-typed value: ""
17:44:45     Node.js is not compiled with OpenSSL crypto support
17:44:45     Error [ERR_NO_CRYPTO]: Node.js is not compiled with OpenSSL crypto support

Originally posted by @MoLow in nodejs/node#44319 (comment)

[aduh95]

It looks like the crash was introduced in #1596.

undici/lib/fetch/util.js

Line 8 in 417e7ab

const { createHash } = require('crypto')

[KhafraDev]

I'm going to work on this (and a few other issues I had with #1596)