Compilation fix after wxCB_ flags move.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@40382 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/combo.h

@@ -45,6 +45,7 @@
 #include "wx/control.h"
 #include "wx/renderer.h" // this is needed for wxCONTROL_XXX flags
 #include "wx/bitmap.h" // wxBitmap used by-value
+#include "wx/combobox.h"
 
 class WXDLLIMPEXP_CORE wxTextCtrl;
 class WXDLLEXPORT wxComboPopup;