[iagno] Depend on unreleased Vala 0.23.0

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 088daea075c1241081170ad4f8e3f633df4a4b11
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Mon Nov 25 13:04:11 2013 -0600

    Depend on unreleased Vala 0.23.0
    
    For GTK+ 3.11.2 bindings

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 38c5fe8..49a2f8d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4,7 +4,7 @@ AM_SILENT_RULES([yes])
 AM_MAINTAINER_MODE
 GNOME_MAINTAINER_MODE_DEFINES
 
-AM_PROG_VALAC([0.16.0])
+AM_PROG_VALAC([0.23])
 AM_PROG_CC_C_O
 
 GLIB_GSETTINGS