feat(driver,iocp): impl AsFd for borrowed handle (#694)

Author: fantix

compio-driver/src/sys/iocp/mod.rs

@@ -228,6 +228,12 @@ impl AsFd for OwnedHandle {
     }
 }
 
+impl AsFd for BorrowedHandle<'_> {
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        (*self).into()
+    }
+}
+
 impl AsFd for socket2::Socket {
     fn as_fd(&self) -> BorrowedFd<'_> {
         self.as_socket().into()
@@ -240,6 +246,12 @@ impl AsFd for OwnedSocket {
     }
 }
 
+impl AsFd for BorrowedSocket<'_> {
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        (*self).into()
+    }
+}
+
 impl AsFd for std::process::ChildStdin {
     fn as_fd(&self) -> BorrowedFd<'_> {
         self.as_handle().into()