[grilo] vala: Add support for Vala 0.18

[Juan A. Suarez Romero <jasuarez src gnome org>]

commit 89778ccaf1865f7f23cd8c9ee00d4daf7002f6cd
Author: Juan A. Suarez Romero <jasuarez igalia com>
Date:   Fri May 18 08:42:18 2012 +0000

    vala: Add support for Vala 0.18
    
    Signed-off-by: Juan A. Suarez Romero <jasuarez igalia com>

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index ac2202b..a4ee0e8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -173,7 +173,7 @@ 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]],
+	m4_foreach([VERSION], [[0.12], [0.14], [0.16], [0.18]],
 		   [PKG_CHECK_EXISTS([ libvala-VERSION ],
                            [ valapkg="libvala-VERSION" ])
 		   ])