dxerr8: Exclude unused header

[Andrew Talbot]

Changelog:
    dxerr8: Exclude unused header.

diff -urN a/dlls/dxerr8/dxerr8.c b/dlls/dxerr8/dxerr8.c
--- a/dlls/dxerr8/dxerr8.c	2006-10-24 19:41:28.000000000 +0100
+++ b/dlls/dxerr8/dxerr8.c	2007-05-02 19:29:47.000000000 +0100
@@ -25,7 +25,6 @@
 #include "winbase.h"
 #include "wingdi.h"
 #include "winuser.h"
-#include "winnls.h"
 
 #include "mmsystem.h"
 #include "dsound.h"