[empathy] build with TP_DISABLE_SINGLE_INCLUDE

[Guillaume Desmottes <gdesmott src gnome org>]

commit 5f307734a736a3af6d0eda6c2ed71527097d8707
Author: Guillaume Desmottes <guillaume desmottes collabora co uk>
Date:   Fri Sep 14 15:35:55 2012 +0200

    build with TP_DISABLE_SINGLE_INCLUDE

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 5f149c1..d9b4bae 100644
--- a/configure.ac
+++ b/configure.ac
@@ -55,6 +55,7 @@ TELEPATHY_GLIB_REQUIRED=0.19.9
 AC_DEFINE(TP_VERSION_MIN_REQUIRED, TP_VERSION_0_20, [Ignore post 0.20 deprecations])
 AC_DEFINE(TP_VERSION_MAX_ALLOWED, TP_VERSION_0_20, [Prevent post 0.20 APIs])
 AC_DEFINE(TP_SEAL_ENABLE, 1, [Prevent to use sealed variables])
+AC_DEFINE(TP_DISABLE_SINGLE_INCLUDE, 1, [Disable single include header])
 
 GSTREAMER_REQUIRED=0.10.32
 TP_FS_REQUIRED=0.6.0