Move x86_64 Requirement into core

Closes Homebrew/homebrew#18886.

Formula/minizinc.rb

@@ -1,24 +1,11 @@
 require 'formula'
 
-class X86_64_Architecture < Requirement
-  fatal true
-
-  satisfy MacOS.prefer_64_bit?
-
-  def message; <<-EOS.undent
-    Your system appears to run on a 32-bit architecture.
-    Minizinc only supports 64-bit architectures, sorry.
-    EOS
-  end
-end
-
-
 class Minizinc < Formula
   homepage 'http://www.g12.csse.unimelb.edu.au/minizinc/'
   url 'http://www.g12.csse.unimelb.edu.au/minizinc/downloads/release-1.6/minizinc-1.6-x86_64-apple-darwin.tar.gz'
   sha1 '71f0e08962eb8bb44c463851f0144c8b006fdb80'
 
-  depends_on X86_64_Architecture
+  depends_on :arch => :x86_64
 
   def patches
     # remove echoed recommendations about linking directories

Formula/postgres-xc.rb

@@ -1,23 +1,11 @@
 require 'formula'
 
-class X86_64_Architecture < Requirement
-  fatal true
-
-  satisfy MacOS.prefer_64_bit?
-
-  def message; <<-EOS.undent
-    Your system appears to run on a 32-bit architecture.
-    Postgres-XC only supports 64-bit architectures, sorry.
-    EOS
-  end
-end
-
 class PostgresXc < Formula
   homepage 'http://postgres-xc.sourceforge.net/'
   url 'http://sourceforge.net/projects/postgres-xc/files/Version_1.0/pgxc-v1.0.2.tar.gz'
   sha1 'f427f37eb141ad9d00374fc1100a55dd09718fed'
 
-  depends_on X86_64_Architecture
+  depends_on :arch => :x86_64
   depends_on 'readline'
   depends_on 'libxml2' if MacOS.version == :leopard # Leopard libxml is too old
   depends_on 'ossp-uuid' => :recommended

Formula/pypy.rb

@@ -7,16 +7,9 @@ end
 
 class Pypy < Formula
   homepage 'http://pypy.org/'
-
-  if MacOS.prefer_64_bit?
-    url 'https://bitbucket.org/pypy/pypy/downloads/pypy-1.9-osx64.tar.bz2'
-    version '1.9'
-    sha1 '825e15724419fbdb6fe215eeea044f9181883c90'
-  else
-    url 'http://pypy.org/download/pypy-1.4.1-osx.tar.bz2'
-    version '1.4.1'
-    sha1 '961470e7510c47b8f56e6cc6da180605ba058cb6'
-  end
+  url 'https://bitbucket.org/pypy/pypy/downloads/pypy-1.9-osx64.tar.bz2'
+  version '1.9'
+  sha1 '825e15724419fbdb6fe215eeea044f9181883c90'
 
   devel do
     url 'https://bitbucket.org/pypy/pypy/downloads/pypy-2.0-beta1-osx64.tar.bz2'
@@ -24,6 +17,8 @@ class Pypy < Formula
     sha1 'e4938fdf33072e457fee6cb22798ec08b5a01978'
   end
 
+  depends_on :arch => :x86_64
+
   def install
     rmtree 'site-packages'
 
@@ -60,8 +55,7 @@ class Pypy < Formula
     end
   end
 
-  def caveats
-    message = <<-EOS.undent
+  def caveats; <<-EOS.undent
     A "distutils.cfg" has been written to:
       #{distutils}
     specifing the install-scripts folder as:
@@ -78,15 +72,6 @@ class Pypy < Formula
 
     See: https://github.com/mxcl/homebrew/wiki/Homebrew-and-Python
     EOS
-
-    unless MacOS.prefer_64_bit?
-      message += "\n" + <<-EOS.undent
-      Outdated PyPy 1.4.1 is the last version with official 32-bit Mac binary.
-      Consider to build modern version yourself: http://pypy.org/download.html#building-from-source
-      EOS
-    end
-
-    return message
   end
 
   # The HOMEBREW_PREFIX location of site-packages
@@ -101,10 +86,6 @@ class Pypy < Formula
 
   # The Cellar location of distutils
   def distutils
-    if MacOS.prefer_64_bit?
-      prefix+"lib-python/2.7/distutils"
-    else
-      prefix+"lib-python/modified-2.5.2/distutils"
-    end
+    prefix+"lib-python/2.7/distutils"
   end
 end