remove Builder.features and Builder.produces?

build_tests/shared_library/shared_library_from_object.rb

@@ -0,0 +1,7 @@
+build do
+  Environment.new do |env|
+    env["CPPPATH"] << "src/lib"
+    env.SharedObject("one.o", "src/lib/one.c")
+    libmine = env.SharedLibrary("mine", ["one.o", "src/lib/two.c"])
+  end
+end