move python packages to pkgs/python-packages

Remove obsolete passthru from joinmarket because joinmarket packages are
now accessible via pkgs/python-packages.

pkgs/python-packages/bencoderpyx/default.nix

@@ -0,0 +1,22 @@
+{ lib, buildPythonPackage, fetchurl, cython, pytest, coverage }:
+
+buildPythonPackage rec {
+  pname = "bencoder.pyx";
+  version = "2.0.1";
+
+  src = fetchurl {
+    url = "https://github.com/whtsky/bencoder.pyx/archive/v${version}.tar.gz";
+    sha256 = "f3ff92ac706a7e4692bed5e6cbe205963327f3076f55e408eb948659923eac72";
+  };
+
+  nativeBuildInputs = [ cython ];
+
+  checkInputs = [ pytest coverage ];
+
+  meta = with lib; {
+    description = "A fast bencode implementation in Cython";
+    homepage = "https://github.com/whtsky/bencoder.pyx";
+    maintainers = with maintainers; [ nixbitcoin ];
+    license = licenses.bsd3;
+  };
+}