[gnome-boxes] build: Bump vala dep to 0.23.3.1 (i-e next release)

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 15451dc3c4d894aa5173a4752712ea34de183112
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Wed Mar 5 15:54:47 2014 +0000

    build: Bump vala dep to 0.23.3.1 (i-e next release)
    
    We already require a very recent version of unstable branch so requiring
    a bit newer version to not have to work around a small issue in gtk+
    binding is totally worth it IMO.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=710279

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 211ca1f..05cdaab 100644
--- a/configure.ac
+++ b/configure.ac
@@ -127,7 +127,7 @@ else
 fi
 AM_CONDITIONAL([HAVE_OVIRT], [test "x$have_govirt" = "xyes"])
 
-VALA_CHECK([0.23.1.1], [
+VALA_CHECK([0.23.3.1], [
   gdk-pixbuf-2.0
   glib-2.0
   gtk+-3.0