bootstrap: address lint failures

Unexpected Clippy lint triggering is fixed in upcoming commits but
is necessary for `cfg(bootstrap)`.

Author: davidtwco

src/bootstrap/src/core/build_steps/test.rs

@@ -2575,7 +2575,7 @@ fn prepare_cargo_test(
     // by `Cargo::new` and that actually makes things go wrong.
     if builder.kind != Kind::Miri {
         let mut dylib_paths = builder.rustc_lib_paths(compiler);
-        dylib_paths.push(PathBuf::from(&builder.sysroot_target_libdir(compiler, target)));
+        dylib_paths.push(builder.sysroot_target_libdir(compiler, target));
         helpers::add_dylib_path(dylib_paths, &mut cargo);
     }
 

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

@@ -566,7 +566,7 @@ 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
     }