convert GPLv2 license to SPDX

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

corkscrew.spec

@@ -1,8 +1,9 @@
 Summary:	Tool for tunneling SSH through HTTP proxies
 Name:		corkscrew
 Version:	2.0
-Release:	37%{?dist}
-License:	GPLv2
+Release:	38%{?dist}
+# Automatically converted from old format: GPLv2 - review is highly recommended.
+License:	GPL-2.0-only
 URL:		http://freshmeat.sourceforge.net/projects/corkscrew
 Source0:	http://www.agroman.net/corkscrew/%{name}-%{version}.tar.gz
 Source1:	%{name}.1
@@ -51,6 +52,9 @@ install -p -m644 %{SOURCE1} $RPM_BUILD_ROOT%{_mandir}/man1
 %{_mandir}/man1/%{name}.1.gz
 
 %changelog
+* Mon Jul 29 2024 Miroslav Suchý <msuchy@redhat.com> - 2.0-38
+- convert license to SPDX
+
 * Wed Jul 17 2024 Fedora Release Engineering <releng@fedoraproject.org> - 2.0-37
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild