Migrate apple-gcc42 back to homebrew/versions.

Closes Homebrew/homebrew#28418.

Formula/apple-gcc42.rb

@@ -1,46 +0,0 @@
-require 'formula'
-
-class AppleGcc42 < Formula
-  homepage 'http://r.research.att.com/tools/'
-  url 'http://r.research.att.com/tools/gcc-42-5666.3-darwin11.pkg'
-  mirror 'http://web.archive.org/web/20130512150329/http://r.research.att.com/tools/gcc-42-5666.3-darwin11.pkg'
-  version '4.2.1-5666.3'
-  sha1 '8fadde2a159082d6474fe9e325b6301e3c0bc84f'
-
-  bottle do
-    cellar :any
-    revision 2
-    sha1 'b1a3f8e2dd3d34bf9a978c3d6a0a4e73879caf18' => :mavericks
-    sha1 'eb6940a80de4e0ab1d65f1729ee08f09e96d58e0' => :mountain_lion
-    sha1 '7b6d895482b11885fd993f423d51ce7e91d017ab' => :lion
-  end
-
-  option 'with-gfortran-symlink', 'Provide gfortran symlinks'
-
-  depends_on :macos => :lion
-
-  def install
-    system "/bin/pax", "--insecure", "-rz", "-f", "usr.pkg/Payload", "-s", ",./usr,#{prefix},"
-
-    if build.with? "gfortran-symlink"
-      safe_system "ln -sf #{bin}/gfortran-4.2 #{bin}/gfortran"
-      safe_system "ln -sf #{man1}/gfortran-4.2.1 #{man1}/gfortran.1"
-    end
-  end
-
-  def caveats
-    <<-EOS.undent
-      NOTE:
-      This formula provides components that were removed from XCode in the 4.2
-      release. There is no reason to install this formula if you are using a
-      version of XCode prior to 4.2.
-
-      This formula contains compilers built from Apple's GCC sources, build
-      5666.3, available from:
-
-        http://opensource.apple.com/tarballs/gcc
-
-      All compilers have a `-4.2` suffix. A GFortran compiler is also included.
-    EOS
-  end
-end