Fix linkage with tests and SSL

This makes the ssl components into an OBJECT library as well, thereby
allowing proper linkage. There's a pending commit to make the openssl
components act as a loadable plugin, but for now that has not been
merged.

Change-Id: I7ae48e419c55d4692056e874114faca4503ee75a
Reviewed-on: http://review.couchbase.org/42059
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>