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

diff --git a/windows/caret.c b/windows/caret.c
index 33bb330..3534306 100644
--- a/windows/caret.c
+++ b/windows/caret.c
@@ -5,6 +5,8 @@
  * Copyright 1996 Frans van Dorsselaer
  */
 
+#include "windef.h"
+#include "wingdi.h"
 #include "wine/wingdi16.h"
 #include "wine/winuser16.h"
 #include "module.h"