Turn more licenses into lib.licenses style

Should eval cleanly, as far as -A tarball tells me.

Relevant: issue #2999, issue #739

pkgs/development/libraries/dbus-glib/default.nix

@@ -20,7 +20,7 @@ stdenv.mkDerivation rec {
 
   meta = {
     homepage = http://dbus.freedesktop.org;
-    license = "AFL-2.1 or GPL-2";
+    license = with stdenv.lib.licenses; [ afl21 gpl2 ];
     description = "Obsolete glib bindings for D-Bus lightweight IPC mechanism";
     maintainers = [ stdenv.lib.maintainers.urkud ];
   };