Auto merge of #4530 - djc:update-deps, r=alexcrichton

Update dependencies

It would be nice to use openssl-0.9.19 in particular, since it supports
newer LibreSSL.

Not sure how this usually works, would it be better to only update openssl and related dependencies? I figured doing everything at once couldn't hurt, and it seems to pass tests locally at least.

Also, would it be feasible to backport this to the beta branch?