Compile and "function" under wasi

[jcaesar]

Sorry for the noise: This is a PR I expect you not to merge, but to close.

Reasons being

• It requires some unpublished / unmerged changes to lscolors and terminal-size
• Getting util to function in an environment without threads, without slowing down all other "proper" platforms, requires somewhat nasty code changes
• Some wasi implementations expose incorrect / 0 values for dev/inode, so the results may be incorrect
• wasi doesn't expose a block size, so the results are definitely incorrect / always in apparent-size mode

The reasons I'm still making this PR are that

1. To show that somebody was "bored" enough to do it. ;)
2. To avoid anybody else getting the same idea, checking the issues for wasm/wasi, and not finding this
3. In the off case that you're super-enthusiastic about wasm/wasi, you can tell me and I will reopen this once the dependency changes have been merged and published.

[bootandy]

thanks for looking at this @jcaesar I'll do my best to remember should wasi come up again.