Fix some broken or add some missing interface declarations for Phoenix

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@68973 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/sizer.h

@@ -1581,6 +1581,11 @@ public:
         Note that this method does not trigger relayout.
     */
     void SetNonFlexibleGrowMode(wxFlexSizerGrowMode mode);
+    
+    virtual void RecalcSizes();
+    
+    virtual wxSize CalcMin();
+    
 };