[ekiga] Fix error with recent gtk where error dialog box has empty text

[Eugen Dedu <ededu src gnome org>]

commit a951d94ccb73dc3e262fcb3028518b5c986813a4
Author: Eugen Dedu <Eugen Dedu pu-pm univ-fcomte fr>
Date:   Wed Jul 24 17:40:39 2013 +0200

    Fix error with recent gtk where error dialog box has empty text
    
    The warnings shown to screen were:
    (lt-ekiga:13496): GLib-GObject-WARNING **: invalid cast from `GtkBox' to `GtkLabel'
    (lt-ekiga:13496): Gtk-CRITICAL **: gtk_label_set_markup: assertion `GTK_IS_LABEL (label)' failed

 lib/engine/gui/gtk-frontend/main_window.cpp |   13 ++++++-------
 1 files changed, 6 insertions(+), 7 deletions(-)
---
diff --git a/lib/engine/gui/gtk-frontend/main_window.cpp b/lib/engine/gui/gtk-frontend/main_window.cpp
index 0bb6cfd..3355822 100644
--- a/lib/engine/gui/gtk-frontend/main_window.cpp
+++ b/lib/engine/gui/gtk-frontend/main_window.cpp
@@ -632,15 +632,14 @@ static bool on_handle_errors (std::string error,
 {
   g_return_val_if_fail (data != NULL, false);
 
-  GtkWidget *dialog = gtk_message_dialog_new (GTK_WINDOW (data),
-                                              GTK_DIALOG_MODAL,
-                                              GTK_MESSAGE_ERROR,
-                                              GTK_BUTTONS_OK, NULL);
+  GtkWidget *dialog = gtk_message_dialog_new_with_markup (GTK_WINDOW (data),
+                                                          GTK_DIALOG_MODAL,
+                                                          GTK_MESSAGE_ERROR,
+                                                          GTK_BUTTONS_OK,
+                                                          error.c_str (),
+                                                          NULL);
 
   gtk_window_set_title (GTK_WINDOW (dialog), _("Error"));
-  gtk_label_set_markup (GTK_LABEL (gtk_message_dialog_get_message_area (GTK_MESSAGE_DIALOG (dialog))),
-                        error.c_str ());
-
   g_signal_connect_swapped (dialog, "response",
                             G_CALLBACK (gtk_widget_destroy),
                             dialog);