This caused an error before when installing Rubinius with RVM because some compiler and FFI files were missing from the staged lib/ directory.
This changes from building a bootstrap Melbourne specifically for MRI to building a bootstrap Melbourne for Rubinius or MRI. In order to build the 1.9 kernel, we must use the 1.9 Melbourne and compiler. This requires a Rubinius bridge to load the compiler over the top of the compiler already loaded.
Conflicts: Rakefile configure lib/fileutils.rb mspec/lib/mspec/helpers.rb rakelib/vm.rake spec/tags/18/ruby/core/kernel/protected_methods_tags.txt spec/tags/20/ruby/core/kernel/private_methods_tags.txt spec/tags/20/ruby/core/kernel/singleton_methods_tags.txt vm/builtin/channel.cpp vm/builtin/io.cpp vm/builtin/object.cpp vm/environment.cpp