swiftformat: Remove

Upstream nixpkgs now uses this.

pkgs/default.nix

@@ -2,5 +2,4 @@
   ipsw = pkgs.callPackage ./ipsw.nix { };
   monaco-powerline = pkgs.callPackage ./monaco-powerline/default.nix { };
   telnet = pkgs.callPackage ./telnet.nix { };
-  swiftformat = pkgs.callPackage ./swiftformat.nix { };
 }

pkgs/swiftformat.nix

@@ -1,31 +0,0 @@
-{ clangStdenv, lib, fetchFromGitHub, swift, swiftpm, swiftPackages }:
-
-swiftPackages.stdenv.mkDerivation rec {
-  pname = "swiftformat";
-  version = "0.56.4";
-
-  src = fetchFromGitHub {
-    owner = "nicklockwood";
-    repo = "SwiftFormat";
-    rev = version;
-    sha256 = "sha256-WnBQTpbz9tcnbvmtWpZ9esirWdQKJOpVmH8zk97OuFE=";
-  };
-
-  nativeBuildInputs = [ swift swiftpm ];
-  buildInputs = [ swiftPackages.Dispatch swiftPackages.Foundation ];
-
-  installPhase = ''
-    binPath="$(swiftpmBinPath)"
-    mkdir -p $out/bin
-    cp $binPath/swiftformat $out/bin/
-  '';
-
-  meta = with lib; {
-    description = "A code formatting and linting tool for Swift";
-    homepage = "https://github.com/nicklockwood/SwiftFormat";
-    license = licenses.mit;
-    maintainers = [ maintainers.bdesham ];
-    platforms = with lib.platforms; linux ++ darwin;
-    hydraPlatforms = [ ];
-  };
-}