xenopsd: add missing dependency

Signed-off-by: Marcello Seri <[email protected]>

Author: Marcello Seri

lib/jbuild

@@ -49,14 +49,14 @@ let () = Printf.ksprintf Jbuild_plugin.V1.send {|
   %s
   (libraries (
     c_stubs
+    stdext
     threads
     threads.posix
     uuidm
     xmlm
     cohttp
     uri
     rpclib
-    ppx_deriving_rpc
     forkexec
     fd-send-recv
     xcp