Support `cargo:rustc-link-arg-*` instructions in build script runner

https://github.com/bazelbuild/rules_rust/pull/1061 is adding support for the `cargo:rustc-link-arg` instruction but `cargo:rust-link-arg-bins`, `cargo:rustc-link-arg-bin` and `cargo:rustc-cdylib-link-arg` are still not supported (they just print a warning).

Supporting them is a little more complex since it requires splitting some of the build script output into crate types. But that should be doable.