wstunnel: deduplicate by using haskellPackages

wstunnel is packaged twice in nixpkgs, once standalone and once in
haskellPackages. The standalone version is outdated while the version in
haskellPackages is updated automatically from Hackage, so we are
removing the standalone Nix expression but still keep the static
executable.

pkgs/development/haskell-modules/configuration-hackage2nix.yaml

@@ -11633,7 +11633,6 @@ broken-packages:
   - wshterm
   - wsjtx-udp
   - wss-client
-  - wstunnel
   - wtk
   - wtk-gtk
   - wu-wei

pkgs/tools/networking/wstunnel/default.nix

@@ -1,41 +0,0 @@
-{ mkDerivation, async, base, base64-bytestring, binary, bytestring
-, classy-prelude, cmdargs, connection, hslogger, mtl, network
-, network-conduit-tls, streaming-commons, text
-, unordered-containers, websockets
-, hspec, iproute
-, lib, fetchFromGitHub, fetchpatch
-}:
-
-mkDerivation rec {
-  pname = "wstunnel";
-  version = "unstable-2020-07-12";
-
-  src = fetchFromGitHub {
-    owner = "erebe";
-    repo = pname;
-    rev = "093a01fa3a34eee5efd8f827900e64eab9d16c05";
-    sha256 = "17p9kq0ssz05qzl6fyi5a5fjbpn4bxkkwibb9si3fhzrxc508b59";
-  };
-
-  isLibrary = false;
-  isExecutable = true;
-
-  libraryHaskellDepends = [
-    async base base64-bytestring binary bytestring classy-prelude
-    connection hslogger mtl network network-conduit-tls
-    streaming-commons text unordered-containers websockets
-    iproute
-  ];
-
-  executableHaskellDepends = [
-    base bytestring classy-prelude cmdargs hslogger text
-  ];
-
-  testHaskellDepends = [ base text hspec ];
-
-  homepage = "https://github.com/erebe/wstunnel";
-  description = "UDP and TCP tunnelling over WebSocket";
-  maintainers = with lib.maintainers; [ gebner ];
-  license = lib.licenses.bsd3;
-
-}

pkgs/top-level/all-packages.nix

@@ -9237,8 +9237,7 @@ in
 
   wsmancli = callPackage ../tools/system/wsmancli {};
 
-  wstunnel = haskell.lib.justStaticExecutables
-    (haskellPackages.callPackage ../tools/networking/wstunnel {});
+  wstunnel = haskell.lib.justStaticExecutables haskellPackages.wstunnel;
 
   wolfebin = callPackage ../tools/networking/wolfebin {
     python = python2;