convert GPLv3+ license to SPDX

This is part of https://fedoraproject.org/wiki/Changes/SPDX_Licenses_Phase_4

xtv.spec

@@ -1,9 +1,10 @@
 Name:		xtv
 Version:	1.0
-Release:	5%{?dist}
+Release:	6%{?dist}
 Summary:	A file manager for the Linux console/xterm
 
-License:	GPLv3+
+# Automatically converted from old format: GPLv3+ - review is highly recommended.
+License:	GPL-3.0-or-later
 URL:		http://sites.google.com/site/mohammedisam2000/home/projects
 Source0:	http://sites.google.com/site/mohammedisam2000/home/projects/%{name}-%{version}.tar.gz
 
@@ -35,6 +36,9 @@ install -D info/xtv.info %{buildroot}%{_infodir}/xtv.info
 
 
 %changelog
+* Thu Jul 25 2024 Miroslav Suchý <msuchy@redhat.com> - 1.0-6
+- convert license to SPDX
+
 * Tue Jul 27 2021 Fedora Release Engineering <releng@fedoraproject.org> - 1.0-5
 - Second attempt - Rebuilt for
   https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild