[empathy/gnome-3-8] libempathy: Fix build by adding missing math.h header

[Guillaume Desmottes <gdesmott src gnome org>]

commit 63ded644beff3bb2501c3df640ca3af795b29e16
Author: Stef Walter <stefw gnome org>
Date:   Sat Apr 27 09:35:37 2013 +0200

    libempathy: Fix build by adding missing math.h header
    
    https://bugzilla.gnome.org/show_bug.cgi?id=699017

 libempathy/empathy-utils.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/libempathy/empathy-utils.c b/libempathy/empathy-utils.c
index 74770c1..b8f54ba 100644
--- a/libempathy/empathy-utils.c
+++ b/libempathy/empathy-utils.c
@@ -39,6 +39,8 @@
 
 #include <extensions/extensions.h>
 
+#include <math.h>
+
 #define DEBUG_FLAG EMPATHY_DEBUG_OTHER
 #include "empathy-debug.h"