* lib/resolv.rb (Resolv::Hosts): should not use win32/resolv on cygwin.
	  [ruby-dev:29945], [ruby-dev:34095]
	* lib/win32/registry.rb (Win32::Registry.expand_environ): try upcased
	  name too for cygwin.  [ruby-dev:29945]
	* lib/win32/resolv.rb (Win32::Resolv.get_hosts_path): use expand_path.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_6@17214 b2dd03c8-39d4-4d8f-98ff-823fe69b080e