Add RanlibFailure

compiler/rustc_codegen_gcc/src/lib.rs

@@ -25,6 +25,7 @@ extern crate rustc_codegen_ssa;
 extern crate rustc_data_structures;
 extern crate rustc_errors;
 extern crate rustc_hir;
+extern crate rustc_macros;
 extern crate rustc_metadata;
 extern crate rustc_middle;
 extern crate rustc_session;
@@ -50,6 +51,7 @@ mod context;
 mod coverageinfo;
 mod debuginfo;
 mod declare;
+mod errors;
 mod int;
 mod intrinsic;
 mod mono_item;