terraform: remove 0.8.5 specific file

It is now handled by the terraform build function instead.

pkgs/applications/networking/cluster/terraform/0.8.5.nix

···
-{ stdenv, lib, buildGoPackage, fetchFromGitHub }:
-
-buildGoPackage rec {
-  name = "terraform-${version}";
-  version = "0.8.5";
-
-  goPackagePath = "github.com/hashicorp/terraform";
-
-  src = fetchFromGitHub {
-    owner  = "hashicorp";
-    repo   = "terraform";
-    rev    = "v${version}";
-    sha256 = "1cxwv3652fpsbm2zk1akw356cd7w7vhny1623ighgbz9ha8gvg09";
-  };
-
-  postInstall = ''
-    # remove all plugins, they are part of the main binary now
-    for i in $bin/bin/*; do
-      if [[ $(basename $i) != terraform ]]; then
-        rm "$i"
-      fi
-    done
-  '';
-
-  meta = with stdenv.lib; {
-    description = "Tool for building, changing, and versioning infrastructure";
-    homepage = "https://www.terraform.io/";
-    license = licenses.mpl20;
-    maintainers = with maintainers; [
-      jgeerds
-      zimbatm
-    ];
-  };
-}