Migrate to SPDX license

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

If there will be no comments in two weeks, I will merge this.

zeromq.spec

@@ -6,7 +6,7 @@ Version:        4.3.5
 Release:        %autorelease
 Summary:        Software library for fast, message-based applications
 
-License:        MPLv2.0 AND BSD-3-Clause AND MIT
+License:        MPL-2.0 AND BSD-3-Clause AND MIT
 URL:            https://zeromq.org
 Source0:        https://github.com/%{name}/libzmq/archive/v%{version}/%{name}-%{version}.tar.gz
 Patch1:         zeromq-configure-c99.patch