remove Builder.features and Builder.produces?

build_tests/library/library_from_object.rb

@@ -0,0 +1,7 @@
+build do
+  Environment.new do |env|
+    env.Program("library.exe", ["lib.a", "three.c"])
+    env.Object("two.o", "two.c")
+    env.Library("lib.a", ["one.c", "two.o"], 'CPPFLAGS' => ['-Dmake_lib'])
+  end
+end