[grilo] vala: Add support for Vala 0.20

[Kalev Lember <klember src gnome org>]

commit 35cfddb88d6240dd5a8acbc132d6ccd4c1e5570f
Author: Kalev Lember <kalevlember gmail com>
Date:   Wed Mar 20 19:55:02 2013 +0100

    vala: Add support for Vala 0.20

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 097640f..9e08558 100644
--- a/configure.ac
+++ b/configure.ac
@@ -221,7 +221,7 @@ AC_ARG_ENABLE([vala],
 AC_MSG_RESULT([$enable_vala])
 if test "x$enable_vala" != "xno"; then
        valapkg=""
-       m4_foreach([VERSION], [[0.12], [0.14], [0.16], [0.18]],
+       m4_foreach([VERSION], [[0.12], [0.14], [0.16], [0.18], [0.20]],
                   [PKG_CHECK_EXISTS([ libvala-VERSION ],
                            [ valapkg="libvala-VERSION" ])
                   ])