Should win32/resolv be included here?

[nobu]

Noticed that lib/resolv.rb requires win32/resolv but it is left in ruby/ruby.
I think it (ext/win32/lib/win32/resolv.rb in ruby/ruby, including ext/win32/resolv/) should be included in ruby/resolv.

One concern is that importing them now would not be able to import the commit histories, is it OK?