tuna: tuna.spec: Add desktop-file-utils

The rpm spec file uses desktop-file-install during the install step.
This is part of the desktop-file-utils package.
This patch adds desktop-file-utils to the BuildRequires list.

Signed-off-by: John Kacur <jkacur@redhat.com>
Signed-off-by: Jiri Kastner <jkastner@redhat.com>
diff --git a/rpm/SPECS/tuna.spec b/rpm/SPECS/tuna.spec
index 97d14f7..3003af6 100644
--- a/rpm/SPECS/tuna.spec
+++ b/rpm/SPECS/tuna.spec
@@ -10,7 +10,7 @@
 Source: http://userweb.kernel.org/~acme/tuna/%{name}-%{version}.tar.bz2
 URL: http://userweb.kernel.org/~acme/tuna/
 BuildArch: noarch
-BuildRequires: python-devel, gettext
+BuildRequires: python-devel, gettext, desktop-file-utils
 Requires: python-ethtool
 Requires: python-linux-procfs >= 0.4.5
 Requires: python-schedutils >= 0.2