mingw32 compilation fixes

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4694 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/gdiimage.h

@@ -21,6 +21,8 @@
 #endif
 
 #include "wx/gdiobj.h"          // base class
+#include "wx/gdicmn.h"          // wxBITMAP_TYPE_INVALID
+#include "wx/list.h"
 
 class WXDLLEXPORT wxGDIImageRefData;
 class WXDLLEXPORT wxGDIImageHandler;