Update source URL (#1458040)

libpng.spec

@@ -2,14 +2,14 @@ Summary:       A library of functions for manipulating PNG image format files
 Name:          libpng
 Epoch:         2
 Version:       1.6.28
-Release:       2%{?dist}
+Release:       3%{?dist}
 License:       zlib
 Group:         System Environment/Libraries
 URL:           http://www.libpng.org/pub/png/
 
 # Note: non-current tarballs get moved to the history/ subdirectory,
 # so look there if you fail to retrieve the version you want
-Source0:       ftp://ftp.simplesystems.org/pub/libpng/png/src/libpng16/libpng-%{version}.tar.gz
+Source0:       https://ftp-osl.osuosl.org/pub/libpng/src/libpng16/libpng-%{version}.tar.gz
 Source1:       pngusr.dfa
 Patch0:        libpng-multilib.patch
 Patch1:        libpng-fix-arm-neon.patch
@@ -110,6 +110,9 @@ make check
 %{_bindir}/pngfix
 
 %changelog
+* Tue Jun 06 2017 Nikola Forró <nforro@redhat.com> - 2:1.6.28-3
+- Update source URL (#1458040)
+
 * Fri Feb 10 2017 Fedora Release Engineering <releng@fedoraproject.org> - 2:1.6.28-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_26_Mass_Rebuild