[vte] vteapp: Fix build with older vala

[Christian Persch <chpe src gnome org>]

commit b61a35cf1bd4babb7945798256132c362786327f
Author: Christian Persch <chpe gnome org>
Date:   Tue May 6 21:29:44 2014 +0200

    vteapp: Fix build with older vala
    
    https://bugzilla.gnome.org/show_bug.cgi?id=729639

 src/app.vala |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/src/app.vala b/src/app.vala
index b9e740a..19e952f 100644
--- a/src/app.vala
+++ b/src/app.vala
@@ -357,12 +357,14 @@ class Window : Gtk.ApplicationWindow
     if (App.Options.no_context_menu)
       return false;
 
-    var match = terminal.match_check_event(event, null);
-
     var menu = new GLib.Menu();
     menu.append("_Copy", "win.copy");
+
+#if VALA_0_24
+    var match = terminal.match_check_event(event, null);
     if (match != null)
       menu.append("Copy _Match", "win.copy-match::" + match);
+#endif
 
     menu.append("_Paste", "win.paste");