[empathy] Add missing build dep

[Kalev Lember]

commit f07bee2ee9829163ca19d29e1d2a27e81b881515
Author: Kalev Lember <kalevlember at gmail.com>
Date:   Tue Oct 14 09:44:10 2014 +0200

    Add missing build dep

 empathy.spec |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/empathy.spec b/empathy.spec
index 5382b7a..d7ea535 100644
--- a/empathy.spec
+++ b/empathy.spec
@@ -31,6 +31,7 @@ BuildRequires:	iso-codes-devel
 BuildRequires:	desktop-file-utils
 BuildRequires:	gettext
 BuildRequires:	glib2-devel >= %{glib2_min_version}
+BuildRequires:	gnutls-devel
 BuildRequires:	libcanberra-devel >= %{libcanberra_version}
 BuildRequires:	webkitgtk3-devel >= %{webkit_version}
 BuildRequires:	gtk3-devel >= %{gtk3_min_version}