Use std::os::raw::c_int instead of std::ffi::c_int

.github/workflows/ci.yml

@@ -81,16 +81,19 @@ jobs:
         cargo build --target x86_64-unknown-illumos
 
   msrv:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     strategy:
+      fail-fast: false
       matrix:
+        os: [ubuntu-latest, windows-latest]
         # When updating this, the reminder to update the minimum supported
         # Rust version in Cargo.toml.
         rust: ['1.47']
     steps:
       - uses: actions/checkout@v3
       - name: Install Rust
-        run: rustup update ${{ matrix.rust }} && rustup default ${{ matrix.rust }}
+        # --no-self-update is necessary because the windows environment cannot self-update rustup.exe.
+        run: rustup update ${{ matrix.rust }} --no-self-update && rustup default ${{ matrix.rust }}
       - run: cargo build
 
   clippy:

src/wepoll.rs

@@ -1,8 +1,8 @@
 //! Bindings to wepoll (Windows).
 
 use std::convert::TryInto;
-use std::ffi::c_int;
 use std::io;
+use std::os::raw::c_int;
 use std::os::windows::io::{AsRawHandle, RawHandle, RawSocket};
 use std::ptr;
 use std::sync::atomic::{AtomicBool, Ordering};