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

diff --git a/windows/sysmetrics.c b/windows/sysmetrics.c
index 97ddf77..0f4a0fd 100644
--- a/windows/sysmetrics.c
+++ b/windows/sysmetrics.c
@@ -7,6 +7,8 @@
 
 #include <stdio.h>
 
+#include "windef.h"
+#include "wingdi.h"
 #include "wine/winuser16.h"
 #include "winbase.h"
 #include "winuser.h"