convert license to SPDX

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

xmlstreambuffer.spec

@@ -1,8 +1,9 @@
 Name:           xmlstreambuffer
 Version:        2.1.0
-Release:        6%{?dist}
+Release:        7%{?dist}
 Summary:        Stream Based Representation for XML Infoset
-License:        BSD
+# Automatically converted from old format: BSD - review is highly recommended.
+License:        LicenseRef-Callaway-BSD
 URL:            https://github.com/eclipse-ee4j/metro-xmlstreambuffer
 BuildArch:      noarch
 ExclusiveArch:  %{java_arches} noarch
@@ -57,6 +58,9 @@ popd
 %license LICENSE.md NOTICE.md
 
 %changelog
+* Wed Sep 04 2024 Miroslav Suchý <msuchy@redhat.com> - 2.1.0-7
+- convert license to SPDX
+
 * Sat Jul 20 2024 Fedora Release Engineering <releng@fedoraproject.org> - 2.1.0-6
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild