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

diff --git a/objects/dc.c b/objects/dc.c
index e9b962b..d99d4ad 100644
--- a/objects/dc.c
+++ b/objects/dc.c
@@ -21,6 +21,8 @@
 #include "font.h"
 #include "callback.h"
 #include "winerror.h"
+#include "windef.h"
+#include "wingdi.h"
 #include "wine/winuser16.h"
 
 DEFAULT_DEBUG_CHANNEL(dc)