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

diff --git a/windows/user.c b/windows/user.c
index 68f380e..549c022 100644
--- a/windows/user.c
+++ b/windows/user.c
@@ -7,6 +7,8 @@
 
 #include <stdlib.h>
 #include "wine/winbase16.h"
+#include "windef.h"
+#include "wingdi.h"
 #include "winuser.h"
 #include "heap.h"
 #include "user.h"