replace license with spdx.org variant

OBS-URL: https://build.opensuse.org/package/show/openSUSE:Factory/fluidsynth?expand=0&rev=22

fluidsynth.spec

@@ -27,7 +27,7 @@ Release:        1
 Group:          Productivity/Multimedia/Sound/Midi
 # Obsoletes:    iiwusynth
 # Provides:     iiwusynth
-License:        LGPLv2.1+
+License:        LGPL-2.1+
 Url:            http://www.fluidsynth.org/
 Source:         %{name}-%{version}.tar.bz2
 Patch1:         fluidsynth-fix-build-lash.diff
@@ -41,7 +41,7 @@ can read MIDI events from the MIDI input device and render them to the
 audio device. It can also play MIDI files.
 
 %package devel
-License:        LGPLv2.1+
+License:        LGPL-2.1+
 Summary:        Development package for the fluidsynth library
 Group:          Development/Libraries/C and C++
 Requires:       libfluidsynth1 = %{version} glibc-devel
@@ -52,7 +52,7 @@ This package contains the files needed to compile programs that use the
 fluidsynth library.
 
 %package -n libfluidsynth1
-License:        LGPLv2.1+
+License:        LGPL-2.1+
 Summary:        Library for Fluidsynth
 Group:          System/Libraries