Add a statement needed to get lighttpd working properly with PHP cUrl.

Summary:
cf.
https://secure.phabricator.com/chatlog/channel/%23phabricator/?date=feb+6%2C+2013
(search for 'csilvers')

Reviewers: alpert, cbhl

Reviewed By: alpert

Differential Revision: http://phabricator.khanacademy.org/D2012