python2Packages: remove superfluous overrides

Since Python 2 is not supported anymore we only keep those overrides
which are used by leaf packages.

pkgs/development/python-modules/ipython/5.nix

@@ -1,72 +0,0 @@
-{ lib
-, stdenv
-, buildPythonPackage
-, fetchPypi
-, fetchpatch
-# Build dependencies
-, glibcLocales
-# Test dependencies
-, nose
-, pygments
-, testpath
-, isPy27
-, mock
-# Runtime dependencies
-, backports_shutil_get_terminal_size
-, decorator
-, pathlib2
-, pickleshare
-, requests
-, simplegeneric
-, traitlets
-, prompt-toolkit
-, pexpect
-, appnope
-}:
-
-buildPythonPackage rec {
-  pname = "ipython";
-  version = "5.8.0";
-
-  src = fetchPypi {
-    inherit pname version;
-    sha256 = "4bac649857611baaaf76bc82c173aa542f7486446c335fe1a6c05d0d491c8906";
-  };
-
-  prePatch = lib.optionalString stdenv.isDarwin ''
-    substituteInPlace setup.py --replace "'gnureadline'" " "
-  '';
-
-  patches = [
-    # Use the proper pygments lexer for python2 (https://github.com/ipython/ipython/pull/12095)
-    (fetchpatch {
-      name = "python2-lexer.patch";
-      url = "https://github.com/ipython/ipython/pull/12095/commits/8805293b5e4bce9150cc2ad9c5d6d984849ae447.patch";
-      sha256 = "16p4gl7a49v76w33j39ih7yspy6x2d14p9bh4wdpg9cafhw9nbc0";
-    })
-  ];
-
-  buildInputs = [ glibcLocales ];
-
-  checkInputs = [ nose pygments testpath ] ++ lib.optional isPy27 mock;
-
-  propagatedBuildInputs = [
-    backports_shutil_get_terminal_size decorator pickleshare prompt-toolkit
-    simplegeneric traitlets requests pathlib2 pexpect
-  ] ++ lib.optionals stdenv.isDarwin [ appnope ];
-
-  LC_ALL="en_US.UTF-8";
-
-  doCheck = false; # Circular dependency with ipykernel
-
-  checkPhase = ''
-    nosetests
-  '';
-
-  meta = {
-    description = "IPython: Productive Interactive Computing";
-    homepage = "http://ipython.org/";
-    license = lib.licenses.bsd3;
-    maintainers = with lib.maintainers; [ bjornfor orivej lnl7 ];
-  };
-}