change Builder#run base class method to new signature

lib/rscons/builder.rb

@@ -128,7 +128,7 @@ module Rscons
     #
     # @return [String,false]
     #   Name of the target file on success or false on failure.
-    def run(target, sources, cache, env, vars)
+    def run(options)
       raise "This method must be overridden in a subclass"
     end
 

spec/rscons/builder_spec.rb

@@ -2,7 +2,7 @@ module Rscons
   describe Builder do
     describe "#run" do
       it "raises an error if called directly and not through a subclass" do
-        expect{subject.run(:target, :sources, :cache, :env, :vars)}.to raise_error /This method must be overridden in a subclass/
+        expect{subject.run({})}.to raise_error /This method must be overridden in a subclass/
       end
     end
   end