[geary/geary-0.11] Fix compilation on Ubuntu Trusty.

[Michael Gratton <mjog src gnome org>]

commit 04034ea621088ab90607cca5452d1fe6025ed771
Author: Michael James Gratton <mike vee net>
Date:   Mon Dec 19 03:13:19 2016 +1100

    Fix compilation on Ubuntu Trusty.
    
    * src/client/components/main-window.vala (MainWindow::on_delete_event):
      Don't use Gdk.EVENT_STOP, it doesn't seem to be supported that far back.

 src/client/components/main-window.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/client/components/main-window.vala b/src/client/components/main-window.vala
index 4acc987..c6148a9 100644
--- a/src/client/components/main-window.vala
+++ b/src/client/components/main-window.vala
@@ -122,7 +122,7 @@ public class MainWindow : Gtk.ApplicationWindow {
         } else {
             GearyApplication.instance.exit();
         }
-        return Gdk.EVENT_STOP;
+        return true;
     }
 
     // Fired on [un]maximize and possibly others. Save maximized state