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/coincurve/default.nix

@@ -0,0 +1,25 @@
+{ lib, buildPythonPackage, fetchPypi, asn1crypto, cffi, pkg-config, libtool, libffi, requests, gmp }:
+
+buildPythonPackage rec {
+  pname = "coincurve";
+  version = "13.0.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1x8dpbq6bwswfyi1g4r421hnswp904l435rf7n6fj7y8q1yn51cr";
+  };
+
+  nativeBuildInputs = [ pkg-config libtool libffi gmp ];
+
+  propagatedBuildInputs = [ asn1crypto cffi requests ];
+
+  # enable when https://github.com/ofek/coincurve/issues/47 is resolved
+  doCheck = false;
+
+  meta = with lib; {
+    description = "Cross-platform Python CFFI bindings for libsecp256k1";
+    homepage = "https://github.com/ofek/coincurve";
+    maintainers = with maintainers; [ nixbitcoin ];
+    license = licenses.asl20;
+  };
+}