Remove top-level cython and cython3

See #11567.

pkgs/applications/networking/instant-messengers/blink/default.nix

···
-{ stdenv, fetchurl, pythonPackages, pyqt4, cython, libvncserver, zlib, twisted
+{ stdenv, fetchurl, pythonPackages, libvncserver, zlib
 , gnutls, libvpx, makeDesktopItem }:
 
 pythonPackages.buildPythonApplication rec {
···
   propagatedBuildInputs = with pythonPackages;[ pyqt4 cjson sipsimple twisted
     ];
 
-  buildInputs = [ cython zlib libvncserver libvpx ];
+  buildInputs = [ pythonPackages.cython zlib libvncserver libvpx ];
 
   desktopItem = makeDesktopItem {
     name = "Blink";

pkgs/applications/version-management/reposurgeon/default.nix

···
-{stdenv, fetchurl, makeWrapper, python27, python27Packages, git,
- docbook_xml_dtd_412, docbook_xml_xslt, asciidoc, xmlto,
- cython ? null,
- bazaar ? null, cvs ? null, darcs ? null, fossil ? null,
- mercurial ? null, monotone ? null, rcs ? null, src ? null,
- subversion ? null, cvs_fast_export ? null }:
+{ stdenv, fetchurl, makeWrapper, python27Packages, git
+, docbook_xml_dtd_412, docbook_xml_xslt, asciidoc, xmlto
+, bazaar ? null, cvs ? null, darcs ? null, fossil ? null
+, mercurial ? null, monotone ? null, rcs ? null, src ? null
+, subversion ? null, cvs_fast_export ? null }:
+
 with stdenv; with lib;
-mkDerivation rec {
+let
+  inherit (python27Packages) python cython;
+in mkDerivation rec {
   name = "reposurgeon-${meta.version}";
   meta = {
     description = "A tool for editing version-control repository history";
···
     makeFlagsArray=(
       XML_CATALOG_FILES="${docbook_xml_dtd_412}/xml/dtd/docbook/catalog.xml ${docbook_xml_xslt}/xml/xsl/docbook/catalog.xml"
       prefix="$out"
-      pyinclude="-I${python27}/include/python2.7"
-      pylib="-L${python27}/lib -lpython2.7"
+      pyinclude="-I${python}/include/python2.7"
+      pylib="-L${python}/lib -lpython2.7"
     )
   '';
 
···
         [ out git bazaar cvs darcs fossil mercurial
           monotone rcs src subversion cvs_fast_export ]
       );
-      pythonpath = makeSearchPathOutput "lib" python27.sitePackages (
+      pythonpath = makeSearchPathOutput "lib" python.sitePackages (
         filter (x: x != null)
         [ python27Packages.readline or null python27Packages.hglib or null ]
       );

pkgs/development/interpreters/renpy/default.nix

···
-{ stdenv, fetchurl, python, cython, pkgconfig, wrapPython
-, pygame, SDL, libpng, ffmpeg, freetype, glew, mesa, fribidi, zlib
+{ stdenv, fetchurl, pythonPackages, pkgconfig, SDL
+, libpng, ffmpeg, freetype, glew, mesa, fribidi, zlib
 }:
+
+with pythonPackages;
 
 stdenv.mkDerivation {
   name = "renpy-6.17.6";

pkgs/tools/X11/xpra/default.nix

···
-{ stdenv, fetchurl, buildPythonApplication, pythonPackages
-, python, cython, pkgconfig
+{ stdenv, fetchurl, pythonPackages, pkgconfig
 , xorg, gtk, glib, pango, cairo, gdk_pixbuf, atk, pycairo
 , makeWrapper, xkbcomp, xorgserver, getopt, xauth, utillinux, which, fontsConf, xkeyboard_config
 , ffmpeg, x264, libvpx, libwebp
 , libfakeXinerama }:
 
-buildPythonApplication rec {
+let
+  inherit (pythonPackages) python cython buildPythonApplication;
+in buildPythonApplication rec {
   name = "xpra-0.17.4";
   namePrefix = "";
   src = fetchurl {

pkgs/top-level/all-packages.nix

···
 
   cryptol = self.haskell.packages.lts.cryptol;
 
-  cython = pythonPackages.cython;
-  cython3 = python3Packages.cython;
-
   devpi-client = callPackage ../development/tools/devpi-client {};
 
   drumstick = callPackage ../development/libraries/drumstick { };
···
   regina = callPackage ../development/interpreters/regina { };
 
   renpy = callPackage ../development/interpreters/renpy {
-    wrapPython = pythonPackages.wrapPython;
     ffmpeg = ffmpeg_2;
   };
 

pkgs/top-level/python-packages.nix

···
       sha256 = "768e568f3299966c294b7eb8cd114fc648f7bfaef422ee9cc750dd8d9d09e44b";
     };
 
-    buildInputs = with self; [ pkgs.cython nose numpy six ];
+    buildInputs = with self; [ cython nose numpy six ];
 
     propagatedBuildInputs = with self; [ pillow matplotlib networkx scipy ];