build-style/cargo.sh: run cargo install with --locked

Without --locked, cargo ignores the Cargo.lock file during install
and rebuilds the crate with updated dependencies.
This wastes time and makes builds unreproducable.

common/build-style/cargo.sh

@@ -18,6 +18,6 @@ do_install() {
 	: ${make_cmd:=cargo}
 
 	${make_cmd} install --path . --target ${RUST_TARGET} --root="${DESTDIR}/usr" \
-		${make_install_args}
+		 --locked ${make_install_args}
 	rm "${DESTDIR}"/usr/.crates.toml
 }