message: Add cross check to filters_target test.
diff: //! Tests for the `cargo tree` command.
  -use cargo_test_support::cross_compile::alternate;
  +use cargo_test_support::cross_compile::{self, alternate};
  use cargo_test_support::registry::{Dependency, Package};
  use cargo_test_support::{basic_manifest, git, project, rustc_host, Project};
  @@ -324,6 +324,9 @@ a v0.1.0 ([..]/foo)
  #[cargo_test]
  fn filters_target() {
  // --target flag
  + if cross_compile::disabled() {
  + return;
  + }
  Package::new("targetdep", "1.0.0").publish();
  Package::new("hostdep", "1.0.0").publish();
  Package::new("devdep", "1.0.0").publish();
  