Remove unnecessary code from debugger

Library/Homebrew/build.rb

@@ -109,10 +109,7 @@ class Build
       end
     end
 
-    if ARGV.debug?
+    formula.extend(Debrew::Formula) if ARGV.debug?
-      formula.extend(Debrew::Formula)
-      formula.resources.each { |r| r.extend(Debrew::Resource) }
-    end
 
     formula.brew do
       formula.patch

Library/Homebrew/debrew.rb

@@ -30,19 +30,6 @@ module Debrew
     end
   end
 
-  module Resource
-    def unpack(target=nil)
-      return super if target
-      super do
-        begin
-          yield self
-        rescue Exception => e
-          Debrew.debug(e)
-        end
-      end
-    end
-  end
-
   class Menu
     Entry = Struct.new(:name, :action)