Fixed header dependencies to be fully compatible with the Windows
headers (with help from Dimitrie O. Paun).

diff --git a/server/queue.c b/server/queue.c
index 65bb680..4868a23 100644
--- a/server/queue.c
+++ b/server/queue.c
@@ -22,9 +22,11 @@
 #include "wine/port.h"
 
 #include <assert.h>
+#include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 
+#include "windef.h"
 #include "winbase.h"
 #include "wingdi.h"
 #include "winuser.h"