pipework: remove dhcp package

Pipework can optionally use dhclient, but supports other dhcp clients as
well, so we can safely remove it.

pkgs/os-specific/linux/pipework/default.nix

@@ -1,5 +1,5 @@
 { stdenv, lib, fetchFromGitHub, makeWrapper
-, bridge-utils, iproute2, lxc, openvswitch, docker, busybox, dhcpcd, dhcp
+, bridge-utils, iproute2, lxc, openvswitch, docker, busybox, dhcpcd
 }:
 
 stdenv.mkDerivation {
@@ -15,7 +15,7 @@ stdenv.mkDerivation {
   installPhase = ''
     install -D pipework $out/bin/pipework
     wrapProgram $out/bin/pipework --prefix PATH : \
-      ${lib.makeBinPath [ bridge-utils iproute2 lxc openvswitch docker busybox dhcpcd dhcp ]};
+      ${lib.makeBinPath [ bridge-utils iproute2 lxc openvswitch docker busybox dhcpcd ]};
   '';
   meta = with lib; {
     description = "Software-Defined Networking tools for LXC";