cgi: don't depend on CGI.pm for tests
cgi: don't depend on CGI.pm for tests

CGI.pm used to be part of the Perl core,
but some distros now bundle perl-core
and perl-modules separately.

It's not worth depending on.

R=golang-dev, mattn.jp
CC=golang-dev
http://codereview.appspot.com/4675063
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go