Migrate dwarf-fortress to Cask. (#11814)

This formula hasn't been updated since 2012, is binary-only, and
closed source. Cask also already provides it, so there's no reason
for brew to.

Formula/dwarf-fortress.rb

@@ -1,32 +0,0 @@
-class DwarfFortress < Formula
-  desc "Open-ended roguelike game"
-  homepage "http://bay12games.com/dwarves/"
-  url "http://www.bay12games.com/dwarves/df_43_05_osx.tar.bz2"
-  version "0.43.05"
-  sha256 "c9614c012c23dcef6197f83d02510d577e1257c5a0de948af5c8f76ae56c5fc8"
-
-  bottle do
-    cellar :any
-    sha256 "13fb0099c9580a39226602194981e78eedead8a6b5711719c688d89158d37ece" => :sierra
-    sha256 "13fb0099c9580a39226602194981e78eedead8a6b5711719c688d89158d37ece" => :el_capitan
-    sha256 "13fb0099c9580a39226602194981e78eedead8a6b5711719c688d89158d37ece" => :yosemite
-  end
-
-  depends_on :arch => :intel
-
-  def install
-    # Dwarf Fortress uses freetype from X11, but hardcodes a path that
-    # isn't installed by modern XQuartz. Point it at wherever XQuartz
-    # happens to be on the user's system.
-    system "install_name_tool", "-change",
-                                "/usr/X11/lib/libfreetype.6.dylib",
-                                "#{MacOS::XQuartz.prefix}/lib/libfreetype.6.dylib",
-                                "libs/SDL_ttf.framework/SDL_ttf"
-
-    (bin/"dwarffortress").write <<-EOS.undent
-      #!/bin/sh
-      exec #{libexec}/df
-    EOS
-    libexec.install Dir["*"]
-  end
-end

tap_migrations.json

@@ -66,6 +66,7 @@
   "dsniff": "homebrew/boneyard",
   "dupx": "homebrew/boneyard",
   "dwarf": "homebrew/boneyard",
+  "dwarf-fortress": "caskroom/cask",
   "echoping": "homebrew/boneyard",
   "edelta": "homebrew/boneyard",
   "ee": "homebrew/boneyard",