[gnome-session] build: Clarify configure output when systemd is used

[Vincent Untz <vuntz src gnome org>]

commit 5e5b6f93b50349ceec93865ce8868214466d164d
Author: Vincent Untz <vuntz gnome org>
Date:   Thu Feb 2 15:50:06 2012 +0100

    build: Clarify configure output when systemd is used
    
    Explicitly mention that ConsoleKit will be used as fallback.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 4c5ffbd..bc02220 100644
--- a/configure.ac
+++ b/configure.ac
@@ -101,7 +101,7 @@ if test x$enable_systemd = xyes; then
                 AC_MSG_ERROR([Systemd support explicitly required, but systemd not found])
         fi
         AC_DEFINE(HAVE_SYSTEMD, 1, [Define if systemd is used for session tracking])
-        session_tracking=systemd
+        session_tracking="systemd (with fallback to ConsoleKit)"
 else
         session_tracking=ConsoleKit
 fi