[libsigc++20] Update download url

[Kalev Lember]

commit 15cb2dd52620fb192b440b38d4de792712eca295
Author: Kalev Lember <kalevlember at gmail.com>
Date:   Mon Sep 15 16:22:47 2014 +0200

    Update download url

 libsigc++20.spec |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libsigc++20.spec b/libsigc++20.spec
index 5b529bc..27ddef6 100644
--- a/libsigc++20.spec
+++ b/libsigc++20.spec
@@ -9,7 +9,7 @@ Summary:        Typesafe signal framework for C++
 Group:          System Environment/Libraries
 License:        LGPLv2+
 URL:            http://libsigc.sourceforge.net/
-Source0:        http://ftp.gnome.org/pub/GNOME/sources/libsigc++/%{release_version}/libsigc++-%{version}.tar.xz
+Source0:        http://download.gnome.org/sources/libsigc++/%{release_version}/libsigc++-%{version}.tar.xz
 
 BuildRequires:  m4