Revert "apparmor: fix and improve the service"

This reverts commit fb6d63f3fd.

I really hope this finally fixes #99236: evaluation on Hydra.
This time I really did check basically the same commit on Hydra:
https://hydra.nixos.org/eval/1618011

Right now I don't have energy to find what exactly is wrong in the
commit, and it doesn't seem important in comparison to nixos-unstable
channel being stuck on a commit over one week old.

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

@@ -1,7 +1,6 @@
 { stdenv, fetchFromGitHub
 , meson, ninja, pkgconfig, gettext, libxslt, docbook_xsl_ns
 , libcap, systemd, libidn2
-, apparmorRulesFromClosure
 }:
 
 with stdenv.lib;
@@ -23,8 +22,6 @@ in stdenv.mkDerivation rec {
     sha256 = "1jhbcz75a4ij1myyyi110ma1d8d5hpm3scz9pyw7js6qym50xvh4";
   };
 
-  outputs = ["out" "apparmor"];
-
   mesonFlags = [
     "-DBUILD_RARPD=true"
     "-DBUILD_TRACEROUTE6=true"
@@ -38,25 +35,6 @@ in stdenv.mkDerivation rec {
   nativeBuildInputs = [ meson ninja pkgconfig gettext libxslt.bin docbook_xsl_ns ];
   buildInputs = [ libcap systemd ]
     ++ optional (!stdenv.hostPlatform.isMusl) libidn2;
-  postInstall = ''
-    install -D /dev/stdin $apparmor/bin.ping <<EOF
-    include <tunables/global>
-    $out/bin/ping {
-      include <abstractions/base>
-      include <abstractions/consoles>
-      include <abstractions/nameservice>
-      include "${apparmorRulesFromClosure {}
-       ([libcap] ++ optional (!stdenv.hostPlatform.isMusl) libidn2)}"
-      include <local/bin.ping>
-      capability net_raw,
-      network inet raw,
-      network inet6 raw,
-      mr $out/bin/ping,
-      r $out/share/locale/**,
-      r @{PROC}/@{pid}/environ,
-    }
-    EOF
-  '';
 
   meta = {
     description = "A set of small useful utilities for Linux networking";