implement wxSpinCtrl::Reparent() to properly reparent both the spin button and the text control part [backport of r52543 from trunk]

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@52582 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/spinctrl.h

@@ -73,6 +73,8 @@ public:
     virtual bool Enable(bool enable = true);
     virtual bool Show(bool show = true);
 
+    virtual bool Reparent(wxWindowBase *newParent);
+
     // wxSpinButton doesn't accept focus, but we do
     virtual bool AcceptsFocus() const { return wxWindow::AcceptsFocus(); }