Resolve couple "cast between incompatible function types" warnings

src/icon_bar.c

@@ -1101,7 +1101,10 @@ rstto_icon_bar_button_release (
 static void
 rstto_icon_bar_invalidate (RsttoIconBar *icon_bar)
 {
-    g_list_foreach (icon_bar->priv->items, (GFunc) rstto_icon_bar_item_invalidate, NULL);
+    GList *lp;
+
+    for (lp = icon_bar->priv->items; lp != NULL; lp = lp->next)
+        rstto_icon_bar_item_invalidate (lp->data);
 
     gtk_widget_queue_resize (GTK_WIDGET (icon_bar));
 }

src/privacy_dialog.c

@@ -368,12 +368,14 @@ rstto_recent_chooser_get_items (
     GList *all_items = gtk_recent_manager_get_items (dialog->priv->recent_manager);
     GList *all_items_iter = all_items;
     GList *items = g_list_copy (all_items);
+    GList *lp;
     GSList *filters = dialog->priv->filters;
     GtkRecentInfo *info;
     GtkRecentFilterInfo filter_info;
     gsize n_applications;
 
-    g_list_foreach (items, (GFunc) gtk_recent_info_ref, NULL);
+    for (lp = items; lp != NULL; lp = lp->next)
+        gtk_recent_info_ref (lp->data);
 
     while (NULL != all_items_iter)
     {