nfs-utils: remove unused tcp-wrappers dependency

nfs-utils _can_ be built with tcp-wrappers support, but this is disabled
by default and needs a `--with-tcp-wrappers` configure flag to be
enabled.

Since we never noticed this was not supported, and tcp-wrappers is
unmaintained in nixpkgs (as is nfs-utils), I think we should just not
include this support for now.

pkgs/by-name/nf/nfs-utils/package.nix

@@ -16,7 +16,6 @@
   lvm2,
   systemd,
   coreutils,
-  tcp_wrappers,
   python3,
   buildPackages,
   nixosTests,
@@ -71,7 +70,6 @@ stdenv.mkDerivation rec {
     libuuid
     keyutils
     libkrb5
-    tcp_wrappers
     libxml2
   ]
   ++ lib.optional enablePython python3