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

diff --git a/misc/tweak.c b/misc/tweak.c
index 4c30596..f6f299a 100644
--- a/misc/tweak.c
+++ b/misc/tweak.c
@@ -29,6 +29,8 @@
  *****************************************************************************/
 
 #include <string.h>
+#include "windef.h"
+#include "wingdi.h"
 #include "winuser.h"
 #include "tweak.h"
 #include "options.h"