Removed #include of wingdi.h and windef.h from winuser.h (and resolved
the resulting compilation failures).

diff --git a/dlls/ntdll/rtl.c b/dlls/ntdll/rtl.c
index c95eb1f..8f2450c 100644
--- a/dlls/ntdll/rtl.c
+++ b/dlls/ntdll/rtl.c
@@ -11,6 +11,8 @@
 #include <string.h>
 #include "heap.h"
 #include "debugtools.h"
+#include "windef.h"
+#include "wingdi.h"
 #include "winuser.h"
 #include "winerror.h"
 #include "stackframe.h"