remove Builder.features and Builder.produces?

spec/rscons/environment_spec.rb

@@ -233,27 +233,5 @@ module Rscons
         expect {env.__send__(:find_finished_thread, false)}.to raise_error /No threads to wait for/
       end
     end
-
-    describe "#features_met?" do
-      it "returns true when the builder provides all requested features" do
-        builder = Struct.new(:features).new(%w[shared other])
-        expect(subject.__send__(:features_met?, builder, %w[shared])).to be_truthy
-      end
-
-      it "returns true when no features are requested" do
-        builder = Struct.new(:features).new([])
-        expect(subject.__send__(:features_met?, builder, [])).to be_truthy
-      end
-
-      it "returns false when a builder does not provide a requested feature" do
-        builder = Struct.new(:features).new(%w[shared other])
-        expect(subject.__send__(:features_met?, builder, %w[other2])).to be_falsey
-      end
-
-      it "returns false when a builder provides a feature that is not desired" do
-        builder = Struct.new(:features).new(%w[shared other])
-        expect(subject.__send__(:features_met?, builder, %w[-shared])).to be_falsey
-      end
-    end
   end
 end