Add a --universal option to readline.

Formula/readline.rb

@@ -12,12 +12,19 @@ to keg-only.
     EOS
   end
 
+  def options
+    [
+      ["--universal", "Build both i386 and x86_64."]
+    ]
+  end
+
   def patches
     patches = (1..4).collect { |n| "ftp://ftp.gnu.org/gnu/readline/readline-6.0-patches/readline60-%03d"%n }
     { :p0 => patches }
   end
 
   def install
+    ENV.universal_binary if ARGV.include? "--universal"
     system "./configure", "--prefix=#{prefix}",
                           "--mandir=#{man}",
                           "--infodir=#{info}",