pythonPackages: remove name attribute`

The `buildPython*` function computes name from `pname` and `version`.
This change removes `name` attribute from all expressions in
`pkgs/development/python-modules`.

While at it, some other minor changes were made as well, such as
replacing `fetchurl` calls with `fetchPypi`.

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

@@ -1,11 +1,14 @@
-{ fetchurl, stdenv, meson, ninja, pkgconfig, python, pygobject3
+{ buildPythonPackage, fetchurl, stdenv, meson, ninja, pkgconfig, python, pygobject3
 , gst-plugins-base, ncurses
 }:
 
-stdenv.mkDerivation rec {
+let
   pname = "gst-python";
   version = "1.14.0";
   name = "${pname}-${version}";
+in buildPythonPackage rec {
+  inherit pname version;
+  format = "other";
 
   src = fetchurl {
     urls = [
@@ -33,9 +36,6 @@ stdenv.mkDerivation rec {
 
   propagatedBuildInputs = [ gst-plugins-base pygobject3 ];
 
-  # Needed for python.buildEnv
-  passthru.pythonPath = [];
-
   meta = {
     homepage = https://gstreamer.freedesktop.org;