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

diff --git a/windows/winhelp.c b/windows/winhelp.c
index 6ce4b54..8f897cb 100644
--- a/windows/winhelp.c
+++ b/windows/winhelp.c
@@ -7,6 +7,8 @@
 #include <string.h>
 #include <unistd.h>
 #include "debugtools.h"
+#include "windef.h"
+#include "wingdi.h"
 #include "wine/winuser16.h"
 #include "wine/winbase16.h"
 #include "winversion.h"