Reformat using the new identifier sorting from rustfmt

compiler/rustc_codegen_gcc/build_system/src/test.rs

@@ -1,6 +1,6 @@
 use std::collections::HashMap;
 use std::ffi::OsStr;
-use std::fs::{remove_dir_all, File};
+use std::fs::{File, remove_dir_all};
 use std::io::{BufRead, BufReader};
 use std::path::{Path, PathBuf};
 use std::str::FromStr;