Bug#607557: backtrace with gnome-panel debug symbols

[Pavel Pushkarev]

Hi.

First of all, Bastien, thanks for the explanation: the gdk_display being
NULL is the point in all the discussion.

I think that it could be easier not to patch the library, but to patch
the examples. The library is useless when the examples are not working
and making the examples work is as simple as adding Gtk::Main (no need
to call run() though — it will be called by the panel):

  int main (int argc, char** argv)
  {
+  Gtk::Main kit(argc, argv);
    Gnome::Panel::init("TestPanelmm", "0.1", argc, argv);