[libgee] Require Vala 0.22 for libgee 0.12

[Maciej Marcin Piechotka <mpiechotka src gnome org>]

commit a00afed1f0489c8be3731f0bffcb21f00264656b
Author: Maciej Piechotka <uzytkownik2 gmail com>
Date:   Sat Aug 17 17:43:23 2013 +0200

    Require Vala 0.22 for libgee 0.12

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 6145ad4..70d16a3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -57,7 +57,7 @@ AC_SUBST(GLIB_LIBS)
 
 GOBJECT_INTROSPECTION_CHECK([0.9.0])
 
-VALA_CHECK([])
+VALA_CHECK([0.21.0])
 
 AC_OUTPUT([Makefile
            gee-0.8.pc