wxRTTI for wxPopupWindow in wxMGL

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@13456 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/popupcmn.cpp

@@ -40,9 +40,9 @@
     #include "wx/univ/renderer.h"
 #endif // __WXUNIVERSAL__
 
-// there is no src/msw/popupwin.cpp to put this in, so we do it here - BTW we
+// there is no src/{msw,mgl}/popupwin.cpp to put this in, so we do it here - BTW we
 // probably could do it for all ports here just as well
-#ifdef __WXMSW__
+#if defined(__WXMSW__) || defined(__WXMGL__)
     IMPLEMENT_DYNAMIC_CLASS(wxPopupWindow, wxWindow)
 #endif // __WXMSW__