Re-enable tidy dependency check for library/backtrace

Author: Urgau

src/tools/tidy/src/deps.rs

@@ -65,7 +65,7 @@ pub(crate) const WORKSPACES: &[(&str, ExceptionList, Option<(&[&str], &[&str])>,
     ),
     // tidy-alphabetical-start
     ("compiler/rustc_codegen_gcc", EXCEPTIONS_GCC, None, &[]),
-    //("library/backtrace", &[], None), // FIXME uncomment once rust-lang/backtrace#562 has been synced back to the rust repo
+    ("library/backtrace", &[], None, &["library/backtrace"]),
     //("library/portable-simd", &[], None), // FIXME uncomment once rust-lang/portable-simd#363 has been synced back to the rust repo
     //("library/stdarch", EXCEPTIONS_STDARCH, None), // FIXME uncomment once rust-lang/stdarch#1462 has been synced back to the rust repo
     ("src/bootstrap", EXCEPTIONS_BOOTSTRAP, None, &[]),