Vendor dependencies

Let's see how I like this workflow.

vendor/io-lifetimes/src/impls_fs_err.rs

@@ -0,0 +1,62 @@
+//! Implementations of io-lifetimes' traits for fs_err's types. In the
+//! future, we'll prefer to have crates provide their own impls; this is
+//! just a temporary measure.
+
+#[cfg(any(unix, target_os = "wasi"))]
+use crate::{AsFd, BorrowedFd, IntoFd, OwnedFd};
+#[cfg(windows)]
+use crate::{AsHandle, BorrowedHandle, IntoHandle, OwnedHandle};
+#[cfg(unix)]
+use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd};
+#[cfg(target_os = "wasi")]
+use std::os::wasi::io::{AsRawFd, FromRawFd, IntoRawFd};
+#[cfg(windows)]
+use std::os::windows::io::{AsRawHandle, FromRawHandle, IntoRawHandle};
+
+#[cfg(any(unix, target_os = "wasi"))]
+impl AsFd for fs_err::File {
+    #[inline]
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) }
+    }
+}
+
+#[cfg(windows)]
+impl AsHandle for fs_err::File {
+    #[inline]
+    fn as_handle(&self) -> BorrowedHandle<'_> {
+        unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) }
+    }
+}
+
+#[cfg(any(unix, target_os = "wasi"))]
+impl IntoFd for fs_err::File {
+    #[inline]
+    fn into_fd(self) -> OwnedFd {
+        unsafe { OwnedFd::from_raw_fd(self.into_raw_fd()) }
+    }
+}
+
+#[cfg(any(unix, target_os = "wasi"))]
+impl From<fs_err::File> for OwnedFd {
+    #[inline]
+    fn from(owned: fs_err::File) -> Self {
+        unsafe { Self::from_raw_fd(owned.into_raw_fd()) }
+    }
+}
+
+#[cfg(windows)]
+impl IntoHandle for fs_err::File {
+    #[inline]
+    fn into_handle(self) -> OwnedHandle {
+        unsafe { OwnedHandle::from_raw_handle(self.into_raw_handle()) }
+    }
+}
+
+#[cfg(windows)]
+impl From<fs_err::File> for OwnedHandle {
+    #[inline]
+    fn from(owned: fs_err::File) -> Self {
+        unsafe { Self::from_raw_handle(owned.into_raw_handle()) }
+    }
+}