python.pkgs.asyncio: remove

> This version is only relevant for Python 3.3,
> which does not include asyncio in its stdlib.
We don't ship 3.3 anymore.

pkgs/development/python-modules/aioamqp/default.nix

@@ -1,5 +1,4 @@
-{ lib, buildPythonPackage, fetchPypi, isPy33, pythonOlder,
-  asyncio
+{ lib, buildPythonPackage, fetchPypi, pythonOlder,
 }:
 
 buildPythonPackage rec {
@@ -17,7 +16,5 @@ buildPythonPackage rec {
     sha256 = "17vrl6jajr81bql7kjgq0zkxy225px97z4g9wmbhbbnvzn1p92c0";
   };
 
-  buildInputs = lib.optionals isPy33 [ asyncio ];
-
   disabled = pythonOlder "3.3";
 }