message: Remove `Clone` for a struct we don't want cloned
  It's super expensive to clone a `Resolve` and the resolution implementation no
  longer needs to do so, let's remove the impl.
diff: @@ -72,7 +72,6 @@ mod encode;
  ///
  /// Each instance of `Resolve` also understands the full set of features used
  /// for each package.
  -#[derive(Clone)]
  pub struct Resolve {
  graph: Graph<PackageId>,
  replacements: HashMap<PackageId, PackageId>,
  