Use common licence attributes from lib/licenses.nix

Many (less easily automatically converted) old-style strings
remain.

Where there was any possible ambiguity about the exact version or
variant intended, nothing was changed. IANAL, nor a search robot.

Use `with stdenv.lib` wherever it makes sense.

pkgs/development/libraries/rabbitmq-java-client/default.nix

@@ -24,7 +24,7 @@ stdenv.mkDerivation rec {
   meta = with stdenv.lib; {
     description = "RabbitMQ Java client library which allows Java code to interface to AMQP servers";
     homepage = http://www.rabbitmq.com/java-client.html;
-    license = [ "MPLv1.1" "GPLv2" ];
+    license = with licenses; [ mpl11 gpl2 ];
     platforms = platforms.linux;
   };
 }