Run clippy CI on more targets (#16340)

This adds MacOS and Windows to the list of hosts for running the clippy
job. This is intended to prevent warnings from being added to the code
which happens from time to time.

This still doesn't have 100% coverage of all code/targets, but this
should cover the vast majority.

Author: epage

.github/workflows/main.yml

@@ -64,7 +64,17 @@ jobs:
 
   # Ensure there are no clippy warnings
   clippy:
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+        - name: Linux x86_64
+          os: ubuntu-latest
+        - name: macOS aarch64
+          os: macos-14
+        - name: Windows x86_64 MSVC
+          os: windows-latest
+    name: Clippy ${{ matrix.name }}
+    runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v5
       - run: rustup update stable && rustup default stable

tests/testsuite/script/cargo.rs

@@ -1,5 +1,4 @@
 use std::fs;
-use std::io::Write;
 
 use crate::prelude::*;
 use cargo_test_support::basic_manifest;
@@ -2179,6 +2178,7 @@ args: []
 #[cargo_test(nightly, reason = "-Zscript is unstable")]
 #[cfg(target_os = "linux")]
 fn memfd_script() {
+    use std::io::Write;
     use std::os::fd::AsRawFd;
 
     let fd = memfd::MemfdOptions::new()