[gnome-chess] Depend on released Vala 0.21

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 230fed7438d4888fa81c3b24e223878d9191a737
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sun Sep 22 17:50:35 2013 -0500

    Depend on released Vala 0.21

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 4154444..f5179a9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -6,7 +6,7 @@ AM_SILENT_RULES([yes])
 AM_MAINTAINER_MODE([enable])
 GNOME_MAINTAINER_MODE_DEFINES
 
-AM_PROG_VALAC([0.20.1.14])
+AM_PROG_VALAC([0.21])
 AM_PROG_CC_C_O
 
 GLIB_GSETTINGS