Build broken due to error on openssl-kdf v0.4.1

[7flying]

error: unsupported output in build script of `openssl-kdf v0.4.1`: `cargo::rustc-link-lib=crypto`
Found a `cargo::key=value` build directive which is reserved for future use.
Either change the directive to `cargo:key=value` syntax (note the single `:`) or upgrade your version of Rust.
See https://doc.rust-lang.org/cargo/reference/build-scripts.html#outputs-of-the-build-script for more information about build script outputs.
warning: build failed, waiting for other jobs to finish...
Error: Process completed with exit code 101.

[7flying]

There is a PR (puiterwijk/rust-openssl-kdf#16) fixing that already on the relevant crate, but we need to wait for a new release.