Add build dependency on the LLD linker

Rust defaults to `rust-lld`, which is somehow different from the no-
prefix "lld". I can add a patch to .cargo/config.toml to override the
linker selection.

debian/control

@@ -7,6 +7,7 @@ Build-Depends:
  debhelper-compat (= 13),
  dh-cargo,
  pkg-config,
+ lld,
  libasound2-dev,
  libudev-dev,
 Homepage: https://git.gelvin.dev/robert/boids