[rygel] build: Really bump vala requirement to 0.18

[Jens Georg <jensgeorg src gnome org>]

commit e7366ecf9f3750bf136836745da437d32043be2c
Author: Jens Georg <jensg openismus com>
Date:   Wed Nov 21 13:34:55 2012 +0100

    build: Really bump vala requirement to 0.18

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index b0f03ff..04f4679 100644
--- a/configure.ac
+++ b/configure.ac
@@ -30,7 +30,7 @@ LT_INIT([dlopen disable-static])
 dnl Required versions of library packages
 GLIB_REQUIRED=2.31.13
 LIBXML_REQUIRED=2.7
-VALA_REQUIRED=0.16.1
+VALA_REQUIRED=0.18.0
 VALADOC_REQUIRED=0.2
 GSSDP_REQUIRED=0.13.0
 GUPNP_REQUIRED=0.19.0