third-party.txt: Include OpenSSL.

Issue #11269 https://github.com/ariya/phantomjs/issues/11269
Make QNetworkReplyHandler deliver content asynchronously
when its load type is set to SynchronousLoad.

Issue #11338: https://github.com/ariya/phantomjs/issues/11338
Upstream bug: https://bugs.webkit.org/show_bug.cgi?id=62808