[gnome-session] Updated gnome-desktop dependency from 3.7.90 to 3.9.91

[Ray Strode <halfline src gnome org>]

commit d4188a8482b62eec0a03f7eff9de37b72360142c
Author: Nathan Maxson <joyfulmantis gmail com>
Date:   Mon Sep 9 12:47:54 2013 -0700

    Updated gnome-desktop dependency from 3.7.90 to 3.9.91
    
    gnome-session will segfault when run with gnome-desktop versions earlier than 3.9.91 see bug 707533

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 06bcafb..354246a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -38,7 +38,7 @@ GTK3_REQUIRED=2.90.7
 DBUS_GLIB_REQUIRED=0.76
 UPOWER_REQUIRED=0.9.0
 JSON_GLIB_REQUIRED=0.10
-GNOME_DESKTOP_REQUIRED=3.7.90
+GNOME_DESKTOP_REQUIRED=3.9.91
 
 AC_ARG_ENABLE(session-selector, AS_HELP_STRING([--enable-session-selector],
                                                [enable building a custom session selector dialog]),