rustc_lint: Remove unused_crate_dependencies from the unused group

src/test/ui/unused-crate-deps/lint-group.rs

@@ -0,0 +1,9 @@
+// `unused_crate_dependencies` is not currently in the `unused` group
+// due to false positives from Cargo.
+
+// check-pass
+// aux-crate:bar=bar.rs
+
+#![deny(unused)]
+
+fn main() {}