rust-bin: fix recent breakage
rust-bin: fix recent breakage

The crate_hash flag is no longer accepted on rust 1.14.  Additionally,
due to the use of wrapper scripts by cargo, we were no longer able to
link correctly due to some link flags getting dropped.  Fix that as well

meta-rust/meta-rust,meta-rust/meta-rust,starlab-io/meta-rust,starlab-io/meta-rust,meta-rust/meta-rust,meta-rust/meta-rust,meta-rust/meta-rust