Bug 1525227 - Remove unnecessary dependency on bindgen in js/src/rust/shared/Cargo.toml. r=mshal

The crate doesn't even have a build script.

Differential Revision: https://phabricator.services.mozilla.com/D18657

--HG--
extra : moz-landing-system : lando

js/src/rust/shared/Cargo.toml

@@ -11,9 +11,6 @@ path = "lib.rs"
 [dependencies]
 baldrdash = { path = "../../wasm/cranelift" }
 
-[build-dependencies]
-bindgen = {version = "0.43", default-features = false} # disable `logging` to reduce code size
-
 # Uncomment this to enable perf support in release mode.
 #[profile.release]
 #debug = true