rpm: Handle different source URLs for maint releases

libvirt.spec.in

@@ -276,10 +276,14 @@ Version: @VERSION@
 Release: 1%{?dist}%{?extra_release}
 License: LGPLv2+
 Group: Development/Libraries
-Source: http://libvirt.org/sources/libvirt-%{version}.tar.gz
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root
 URL: http://libvirt.org/
 
+%if %(echo %{version} | grep -o \\. | wc -l) == 3
+%define mainturl stable_updates/
+%endif
+Source: http://libvirt.org/sources/%{?mainturl}libvirt-%{version}.tar.gz
+
 %if %{with_libvirtd}
 Requires: libvirt-daemon = %{version}-%{release}
 %if %{with_network}