[gtk+] Bump version

[Matthias Clasen <matthiasc src gnome org>]

commit d4e3d4ae9bfd8752b663d47c59df3be028e9b957
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Mar 20 12:36:33 2012 -0400

    Bump version

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 46be45a..f4762ec 100644
--- a/configure.ac
+++ b/configure.ac
@@ -10,7 +10,7 @@
 
 m4_define([gtk_major_version], [3])
 m4_define([gtk_minor_version], [3])
-m4_define([gtk_micro_version], [20])
+m4_define([gtk_micro_version], [21])
 m4_define([gtk_interface_age], [0])
 m4_define([gtk_binary_age],
           [m4_eval(100 * gtk_minor_version + gtk_micro_version)])