Version: kill silly class method

Overriding <=> directly is much simpler.

Library/Homebrew/version.rb

@@ -188,13 +188,6 @@ class Version
     m = /\.v(\d+[a-z]?)/.match(stem)
     return m.captures.first unless m.nil?
   end
-
-  # DSL for defining comparators
-  class << self
-    def compare &blk
-      send(:define_method, '<=>', &blk)
-    end
-  end
 end
 
 class VersionSchemeDetector
@@ -220,13 +213,14 @@ end
 
 # Enable things like "MacOS.version >= :lion"
 class MacOSVersion < Version
-  compare do |other|
-    super Version.new case other
+  def <=>(other)
+    v = case other
         when :mountain_lion then 10.8
         when :lion          then 10.7
         when :snow_leopard  then 10.6
         when :leopard       then 10.5
         else other.to_s
         end
+    super(Version.new(v))
   end
 end