* lib/cgi-lib.rb: Checking for constant MOD_RUBY instead of
	  environment variable. Remove a mod_ruby warning and use
	  Apache::request.headers_out[] instead.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_6@2480 b2dd03c8-39d4-4d8f-98ff-823fe69b080e