message: Fix flakey broken_fixes_backed_out test.
  Since `fix` does `--all-targets` there is a race condition as to which target goes first. This has less than a 1% failure rate on CI, but it has been seen several times lately:
diff: @@ -123,7 +123,7 @@ fn broken_fixes_backed_out() {
  p.cargo("build").cwd(p.root().join("foo")).run();
  // Attempt to fix code, but our shim will always fail the second compile
  - p.cargo("fix --allow-no-vcs")
  + p.cargo("fix --allow-no-vcs --lib")
  .cwd(p.root().join("bar"))
  .env("__CARGO_FIX_YOLO", "1")
  .env("RUSTC", p.root().join("foo/target/debug/foo"))
  