[gnome-clocks] Bump Vala version

[Paolo Borelli <pborelli src gnome org>]

commit 038bb25c23ab8582309299bc221ba4c2d08af5d7
Author: Paolo Borelli <pborelli gnome org>
Date:   Tue Feb 18 20:47:35 2014 +0100

    Bump Vala version

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 6457bca..47b762e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -27,7 +27,7 @@ AC_PROG_CC
 AC_PROG_CC_STDC
 AC_PROG_INSTALL
 AC_PROG_MAKE_SET
-AM_PROG_VALAC([0.21.2])
+AM_PROG_VALAC([0.23.3])
 
 # _NL_TIME_FIRST_WEEKDAY is an enum and not a define
 AC_MSG_CHECKING([for _NL_TIME_FIRST_WEEKDAY])