convert license to SPDX

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

nextcloud-client.spec

@@ -9,7 +9,8 @@ Release:        %autorelease
 Summary:        The Nextcloud Client
 
 # -libs are LGPLv2+, rest GPLv2
-License:        LGPLv2+ and GPLv2
+# Automatically converted from old format: LGPLv2+ and GPLv2 - review is highly recommended.
+License:        LicenseRef-Callaway-LGPLv2+ AND GPL-2.0-only
 Url:            https://nextcloud.com/install/#install-clients
 Source0:        https://github.com/nextcloud/desktop/archive/v%{version}/desktop-%{version}.tar.gz
 Source1:        com.nextcloud.desktopclient.nextcloud.metainfo.xml
@@ -85,7 +86,8 @@ the directory and the Nextcloud Client does the rest.
 
 %package libs
 Summary: Common files for nextcloud-client
-License: LGPLv2+
+# Automatically converted from old format: LGPLv2+ - review is highly recommended.
+License: LicenseRef-Callaway-LGPLv2+
 Provides: mirall-common = %{version}-%{release}
 Obsoletes: mirall-common < 1.8.0
 Requires: %{name}%{?_isa} = %{version}-%{release}
@@ -97,7 +99,8 @@ configuration file that determines the excluded files in a sync.
 
 %package devel
 Summary: Development files for nextcloud-client
-License: LGPLv2+
+# Automatically converted from old format: LGPLv2+ - review is highly recommended.
+License: LicenseRef-Callaway-LGPLv2+
 Requires: %{name}-libs%{?_isa} = %{version}-%{release}
 Requires: %{name}%{?_isa} = %{version}-%{release}
 Provides: %{name}-static = %{version}-%{release}