[empathy] We need to pass a description to AC_DEFINE

[Guillaume Desmottes <gdesmott src gnome org>]

commit f2bb34846e17803a2601f46be59a54ada0406bbc
Author: Guillaume Desmottes <guillaume desmottes collabora co uk>
Date:   Tue Oct 25 16:00:33 2011 +0200

    We need to pass a description to AC_DEFINE

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 2ddbded..a8f7e4e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -67,7 +67,7 @@ NETWORK_MANAGER_REQUIRED=0.7.0
 # Disable GLib deprecation warnings for now; we don't want to bump the GLib dep
 # and make things harder for contributiors without good reason. We'll re-enable
 # those warnings later during the cycle (bgo #662662)
-AC_DEFINE(GLIB_DISABLE_DEPRECATION_WARNINGS, 1, [])
+AC_DEFINE(GLIB_DISABLE_DEPRECATION_WARNINGS, 1, [Build with GLib deprecated])
 
 # telepathy-yell
 prev_top_build_prefix=$ac_top_build_prefix