Don't remove the linux ipv6 original_dst test

Signed-off-by: keithmattix <keithmattix@microsoft.com>

tests/socket.rs

@@ -1626,6 +1626,25 @@ fn original_dst() {
     }
 }
 
+#[test]
+#[cfg(all(
+    feature = "all",
+    any(target_os = "android", target_os = "fuchsia", target_os = "linux")
+))]fn original_dst_ipv6() {
+    let socket = Socket::new(Domain::IPV6, Type::STREAM, None).unwrap();
+    match socket.original_dst_ipv6() {
+        Ok(_) => panic!("original_dst_ipv6 on non-redirected socket should fail"),
+        Err(err) => assert_eq!(err.raw_os_error(), Some(libc::ENOENT)),
+    }
+
+    // Not supported on IPv4 socket.
+    let socket = Socket::new(Domain::IPV4, Type::STREAM, None).unwrap();
+    match socket.original_dst_ipv6() {
+        Ok(_) => panic!("original_dst_ipv6 on non-redirected socket should fail"),
+        Err(err) => assert_eq!(err.raw_os_error(), Some(libc::EOPNOTSUPP)),
+    }
+}
+
 #[test]
 #[cfg(all(feature = "all", target_os = "windows"))]
 fn original_dst_ipv6() {