Mark FromRawFd impl for Stdio as deprecated

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>

Author: NobodyXu

src/stdio.rs

@@ -67,6 +67,8 @@ impl Stdio {
 /// NOTE that the fd must be in blocking mode, otherwise
 /// ssh might not flush all output since it considers
 /// (`EAGAIN`/`EWOULDBLOCK`) as an error
+#[allow(useless_deprecated)]
+#[deprecated(since = "0.9.8", note = "Use Stdio::from_raw_fd_owned instead")]
 impl FromRawFd for Stdio {
     unsafe fn from_raw_fd(fd: RawFd) -> Self {
         Self(StdioImpl::Fd(OwnedFd::from_raw_fd(fd), false))