[gnome-session] build: use gtk3 by default

[Ray Strode <halfline src gnome org>]

commit d5a9bd7aeb3032f0c3c921a0680eb2b25ac36d32
Author: Ray Strode <rstrode redhat com>
Date:   Tue Sep 21 14:26:22 2010 -0400

    build: use gtk3 by default

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 37e00b1..73d789b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -45,7 +45,7 @@ AC_ARG_WITH([gtk],
      2.0|3.0) ;;
      *) AC_MSG_ERROR([invalid gtk version specified]) ;;
    esac],
-  [with_gtk=2.0])
+  [with_gtk=3.0])
 AC_MSG_RESULT([$with_gtk])
 
 GLIB_REQUIRED=2.16.0