bootstrap: address lint failures

It's entirely unclear why Clippy lints trigger in bootstrap with this
patch and not on master but the lints can be fixed and everything still
works then linting passes.

Author: davidtwco

src/bootstrap/src/core/build_steps/tool.rs

@@ -552,7 +552,7 @@ impl ErrorIndex {
         let compiler = builder.compiler_for(builder.top_stage, host, host);
         let mut cmd = command(builder.ensure(ErrorIndex { compiler }).tool_path);
         let mut dylib_paths = builder.rustc_lib_paths(compiler);
-        dylib_paths.push(PathBuf::from(&builder.sysroot_target_libdir(compiler, compiler.host)));
+        dylib_paths.push(builder.sysroot_target_libdir(compiler, compiler.host));
         add_dylib_path(dylib_paths, &mut cmd);
         cmd
     }