get rid of unusable condition

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@5226 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/webrick/cgi.rb

@@ -41,7 +41,7 @@ module WEBrick
         @header["status"] ||= @status
         super
       end
-      unless @config[:NPH] or defined?(MOD_RUBY)
+      unless @config[:NPH]
         def res.status_line
           ""
         end