nodejs-8_x: Drop package

It will be EOL within the support period of 19.09

pkgs/development/node-packages/composition-v8.nix

@@ -1,17 +0,0 @@
-# This file has been generated by node2nix 1.7.0. Do not edit!
-
-{pkgs ? import <nixpkgs> {
-    inherit system;
-  }, system ? builtins.currentSystem, nodejs ? pkgs."nodejs-8_x"}:
-
-let
-  nodeEnv = import ./node-env.nix {
-    inherit (pkgs) stdenv python2 utillinux runCommand writeTextFile;
-    inherit nodejs;
-    libtool = if pkgs.stdenv.isDarwin then pkgs.darwin.cctools else null;
-  };
-in
-import ./node-packages-v8.nix {
-  inherit (pkgs) fetchurl fetchgit;
-  inherit nodeEnv;
-}

pkgs/development/node-packages/default-v8.nix

@@ -1,27 +0,0 @@
-{ pkgs, nodejs, stdenv }:
-
-let
-  nodePackages = import ./composition-v8.nix {
-    inherit pkgs nodejs;
-    inherit (stdenv.hostPlatform) system;
-  };
-in
-nodePackages // {
-  pnpm = nodePackages.pnpm.override {
-    nativeBuildInputs = [ pkgs.makeWrapper ];
-    postInstall = let
-      pnpmLibPath = stdenv.lib.makeBinPath [
-        nodejs.passthru.python
-        nodejs
-      ];
-    in ''
-      for prog in $out/bin/*; do
-        wrapProgram "$prog" --prefix PATH : ${pnpmLibPath}
-      done
-    '';
-  };
-
-  stf = nodePackages.stf.override {
-    nativeBuildInputs = with pkgs; [ yasm czmq protobufc ];
-  };
-}

pkgs/development/node-packages/node-packages-v8.json

@@ -1,13 +0,0 @@
-[
-  "alloy"
-, "azure-cli"
-, "bower"
-, "coffee-script"
-, "grunt-cli"
-, "node-gyp"
-, "node-gyp-build"
-, "node-pre-gyp"
-, "pnpm"
-, "stf"
-, "titanium"
-]