libcap_ng: remove unused code for python bindings

The code was introduced way back in 2015 and is unused since then.

https://github.com/NixOS/nixpkgs/commit/2dc9cb1120cc172055601182e76ee4759cd22fe9

pkgs/os-specific/linux/libcap-ng/default.nix

···
-{ lib, stdenv, fetchurl, swig ? null, python2 ? null, python3 ? null }:
-
-assert python2 != null || python3 != null -> swig != null;
+{ lib, stdenv, fetchurl }:
 
 stdenv.mkDerivation rec {
   pname = "libcap-ng";
-  # When updating make sure to test that the version with
-  # all of the python bindings still works
   version = "0.8.3";
 
   src = fetchurl {
-    url = "${meta.homepage}/${pname}-${version}.tar.gz";
+    url = "https://people.redhat.com/sgrubb/libcap-ng/libcap-ng-${version}.tar.gz";
     sha256 = "sha256-vtb2hI4iuy+Dtfdksq7w7TkwVOgDqOOocRyyo55rSS0=";
   };
 
-  nativeBuildInputs = [ swig ];
-  buildInputs = [ python2 python3 ];
-
-  postPatch = ''
-    function get_header() {
-      echo -e "#include <$1>" | gcc -M -xc - | tr ' ' '\n' | grep "$1" | head -n 1
-    }
-
-    # Fix some hardcoding of header paths
-    sed -i "s,/usr/include/linux/capability.h,$(get_header linux/capability.h),g" bindings/python{,3}/Makefile.in
-  '';
-
   configureFlags = [
-    (if python2 != null then "--with-python" else "--without-python")
-    (if python3 != null then "--with-python3" else "--without-python3")
+    "--without-python"
   ];
 
-  meta = let inherit (lib) platforms licenses; in {
+  meta = with lib; {
     description = "Library for working with POSIX capabilities";
     homepage = "https://people.redhat.com/sgrubb/libcap-ng/";
     platforms = platforms.linux;

pkgs/top-level/all-packages.nix

···
 
   libcap = callPackage ../os-specific/linux/libcap { };
 
-  libcap_ng = callPackage ../os-specific/linux/libcap-ng {
-    swig = null; # Currently not using the python2/3 bindings
-    python2 = null; # Currently not using the python2 bindings
-    python3 = null; # Currently not using the python3 bindings
-  };
+  libcap_ng = callPackage ../os-specific/linux/libcap-ng { };
 
   libnotify = callPackage ../development/libraries/libnotify { };