Document license of binary package

https://fedoraproject.org/wiki/Packaging:LicensingGuidelines#License:_field

Signed-off-by: Nils Philippsen <nils@tiptoe.de>

libffado.spec

@@ -2,9 +2,7 @@ Summary:        Free firewire audio driver library
 Name:           libffado
 Version:        2.4.4
 Release:        1%{?dist}
-# src/libutil/float_cast.h is LGPLv2+.
-# The rest is (GPLv2 or GPLv3)
-License:        LGPLv2+ and (GPLv2 or GPLv3)
+License:        GPLv2 or GPLv3
 URL:            http://www.ffado.org/
 Source0:        http://www.ffado.org/files/%{name}-%{version}.tgz
 # The trunk is tarballed as follows:
@@ -162,6 +160,7 @@ appstream-util validate-relax --nonet \
 %changelog
 * Tue Jan 05 2020 Nils Philippsen <nils@tiptoe.de> - 2.4.4-1
 - Version 2.4.4
+- Document license of binary package
 
 * Tue Jul 28 2020 Fedora Release Engineering <releng@fedoraproject.org> - 2.4.3-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild