Homebrew formula for official ghc 7.10.2 binaries

ghc.rb

class Ghc < Formula
  desc "Glorious Glasgow Haskell Compilation System"
  homepage "https://haskell.org/ghc/"
  url "https://downloads.haskell.org/~ghc/8.0.2/ghc-8.0.2-x86_64-apple-darwin.tar.xz"
  sha256 "11625453e1d0686b3fa6739988f70ecac836cadc30b9f0c8b49ef9091d6118b1"

  def install
    system "./configure", "--prefix=#{prefix}"

    ENV.deparallelize { system "make", "install" }
  end

  test do
    (testpath/"hello.hs").write('main = putStrLn "Hello Homebrew"')
    system "runghc", testpath/"hello.hs"
  end
end