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

diff --git a/controls/desktop.c b/controls/desktop.c
index c170f2c..78e2abe 100644
--- a/controls/desktop.c
+++ b/controls/desktop.c
@@ -10,6 +10,7 @@
 
 #include "desktop.h"
 #include "windef.h"
+#include "wingdi.h"
 #include "heap.h"
 #include "monitor.h"
 #include "win.h"