server: Use the same field for process and thread handle in the queue_apc request.
diff --git a/server/protocol.def b/server/protocol.def
index ad05b64..a4c154c 100644
--- a/server/protocol.def
+++ b/server/protocol.def
@@ -673,8 +673,7 @@
 
 /* Queue an APC for a thread or process */
 @REQ(queue_apc)
-    obj_handle_t thread;       /* thread handle */
-    obj_handle_t process;      /* process handle */
+    obj_handle_t handle;       /* thread or process handle */
     apc_call_t   call;         /* call arguments */
 @REPLY
     obj_handle_t handle;       /* APC handle */