[new] devel/cargo-audit a tool to check yer crates for security vulns!!

Hi,

Here is a port of cargo-audit:
https://github.com/RustSec/rustsec/tree/main/cargo-audit

This isn't the latest version because that fails to build:
https://github.com/rustsec/rustsec/issues/429

Unfortunately the program doesn't run unless you specify the full
path. I tried creating a patch to fix it, but I can't make heads or
tails of the code.

Thanks to tb@ and semarie@ for pointers on the Makefile!

Here is a git mirror as well:
https://github.com/jasperla/openbsd-wip/tree/master/devel/cargo-audit

OK? Cluesticks?

Cheers,
Aaron