Don't use deprected "1" value to cURL CURLOPT_SSL_VERIFYHOST
Summary: Fixes T2962. That task discusses this issue.
Test Plan: Read php-curl documentation to verify this change makes sense. Sent an email with SES.
Reviewers: btrahan, garoevans
Reviewed By: garoevans
CC: aran
Maniphest Tasks: T2962
Differential Revision: https://secure.phabricator.com/D5669