monkeysAudio: Update license

pkgs/applications/audio/monkeys-audio/default.nix

@@ -24,7 +24,10 @@ gcc10Stdenv.mkDerivation rec {
   meta = with lib; {
     description = "Lossless audio codec";
     platforms = platforms.linux;
-    license = licenses.lgpl2;
+    # This is not considered a GPL license, but it seems rather free although
+    # it's not standard, see a quote of it:
+    # https://github.com/NixOS/nixpkgs/pull/171682#issuecomment-1120260551
+    license = licenses.free;
     maintainers = [ ];
   };
 }