Fix Script execution of configure task blocks

lib/rscons/script.rb

@@ -341,9 +341,7 @@ module Rscons
       cdsl = ConfigureDsl.new(self, configure_op)
       configure_task = Task["configure"]
       configure_task.actions.each do |action|
-        cdsl.instance_eval do
+        cdsl.instance_exec(configure_task, configure_task.param_values, &action)
-          action[configure_task, configure_task.param_values]
-        end
       end
     end