(WEBrick::HTTPServlet::CGIhandler#do_GET): set SystemRoot environment
variable to CGI process on Windows native platforms. [ruby-dev:23936]
* lib/webrick/httpservlet/cgihandler.rb
(WEBrick::HTTPServlet::CGIhandler#do_GET): use $?.exitstatus and
refine log message.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@6676 b2dd03c8-39d4-4d8f-98ff-823fe69b080e