Fix missing or broken interface items for Phoenix

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73300 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/sizer.h

@@ -1883,6 +1883,12 @@ public:
     */
     int GetOrientation() const;
 
+    /**
+        Sets the orientation of the box sizer, either wxVERTICAL
+        or wxHORIZONTAL.
+    */
+    void SetOrientation(int orient);
+
     /**
         Implements the calculation of a box sizer's dimensions and then sets
         the size of its children (calling wxWindow::SetSize if the child is a window).