software_spec: add new bottle check class.

Library/Homebrew/software_spec.rb

@@ -344,3 +344,17 @@ class BottleSpecification
     checksums
   end
 end
+
+class PourBottleCheck
+  def initialize(formula)
+    @formula = formula
+  end
+
+  def reason(reason)
+    @formula.pour_bottle_check_unsatisfied_reason(reason)
+  end
+
+  def satisfy(&block)
+    @formula.send(:define_method, :pour_bottle?, &block)
+  end
+end