[Bug #543](Closed) cgi.rb : obsolete regex "n" option except CGI#pretty

e$B%A%1%C%He(B #543 e$B$,99?7$5$l$^$7$?!#e(B (by Takeyuki F.)

e$B%9%F!<%?%9e(B Opene$B$+$ie(BClosede$B$KJQ99e(B

Applied in changeset r19245.

http://redmine.ruby-lang.org/issues/show/543