[longomatch] Add missing using

[Andoni Morales Alastruey <amorales src gnome org>]

commit 4d89dce2f78ce70b3ace74144485dfc58d24d939
Author: Andoni Morales Alastruey <ylatuya gmail com>
Date:   Mon Aug 4 15:11:41 2014 +0200

    Add missing using

 LongoMatch/Main.cs |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/LongoMatch/Main.cs b/LongoMatch/Main.cs
index bfcd6ff..54b2531 100644
--- a/LongoMatch/Main.cs
+++ b/LongoMatch/Main.cs
@@ -16,6 +16,7 @@
 // along with this program; if not, write to the Free Software
 //Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
 //
+using System;
 using System.IO;
 using System.Reflection;
 using Gtk;