Must have valid colours for X11 popup window implementation

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@27446 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/x11/popupwin.h

@@ -27,7 +27,7 @@ class wxPopupWindow: public wxPopupWindowBase
 {
 public:
     wxPopupWindow() { }
-    virtual ~wxPopupWindow() { }
+    virtual ~wxPopupWindow() ;
 
     wxPopupWindow(wxWindow *parent, int flags = wxBORDER_NONE)
         { (void)Create(parent, flags); }